Organic light-emitting device

ABSTRACT

The present specification relates to an organic light emitting diode.

TECHNICAL FIELD

The present specification claims priority from Korean Patent ApplicationNo. 10-2014-0040818, filed on Apr. 4, 2014, Korean Patent ApplicationNo. 10-2015-0011540, filed on Jan. 23, 2015, and Korean PatentApplication No. 10-2015-0011570, filed on Jan. 23, 2015, the contents ofwhich are incorporated herein by reference in their entireties.

The present specification relates to an organic light emitting diode.

BACKGROUND ART

An organic light emission phenomenon is one of the examples ofconverting current into visible rays through an internal process of aspecific organic molecule. The principle of the organic light emissionphenomenon is as follows.

When an organic material layer is disposed between an anode and acathode, if voltage is applied between the two electrodes, electrons andholes are injected from the cathode and the anode, respectively, intothe organic material layer. The electrons and the holes which areinjected into the organic material layer are recombined to form anexciton, and the exciton falls down again to the ground state to emitlight. An organic light emitting diode using this principle may becomposed of a cathode, an anode, and an organic material layer disposedtherebetween, for example, an organic material layer including a holeinjection layer, a hole transporting layer, a light emitting layer, andan electron transporting layer.

The materials used in the organic light emitting diode are mostly pureorganic materials or complex compounds in which organic materials andmetals form a complex, and may be classified into a hole injectionmaterial, a hole transporting material, a light emitting material, anelectron transporting material, an electron injection material, and thelike according to the use thereof. Here, an organic material having ap-type property, that is, an organic material, which is easily oxidizedand electrochemically stable when the material is oxidized, is usuallyused as the hole injection material or the hole transporting material.Meanwhile, an organic material having an n-type property, that is, anorganic material, which is easily reduced and electrochemically stablewhen the material is reduced, is usually used as the electron injectionmaterial or the electron transporting material. As the light emittinglayer material, a material having both p-type and n-type properties,that is, a material, which is stable during both the oxidation andreduction states, is preferred, and when an exciton is formed, amaterial having high light emitting efficiency for converting theexciton into light is preferred.

There is a need for developing an organic light emitting diode havinghigh efficiency in the art.

CITATION LIST Patent Document

Official Gazette of Korean Patent Application Laid-Open No. 2000-0051826

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

An object of the present specification is to provide an organic lightemitting diode having high light emitting efficiency and/or low drivingvoltage.

Technical Solution

The present specification provides an organic light emitting diodeincluding: a cathode; an anode; a light emitting layer provided betweenthe cathode and the anode; a first electron transporting layer includinga heterocyclic compound represented by the following Formula 1 andprovided between the cathode and the light emitting layer; and a secondelectron transporting layer provided between the cathode and the firstelectron transporting layer, in which the second electron transportinglayer includes a host material including one or two or more of compoundsrepresented by the following Formulae 3 to 5 and one or two or moren-type dopants selected from alkali metals and alkaline earth metals.

in Formula 1,

Ar1 to Ar3 are different from each other,

Ar1 and Ar2 are each independently a substituted or unsubstituted arylgroup; or a substituted or unsubstituted heterocyclic group,

Ar3 is represented by the following Formula 2,

in Formula 2,

R1 to R4 are the same as or different from each other, and eachindependently hydrogen; deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a substituted or unsubstituted alkylgroup; a substituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group, or combine with an adjacent group toform a substituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring, or the substituents in the same carboncombine with each other to form a substituted or unsubstituted spirobond,

L1 is a direct bond; a substituted or unsubstituted arylene group; or asubstituted or unsubstituted divalent heterocyclic group,

l is an integer of 1 to 5,

m is an integer of 1 to 3,

n is an integer of 1 to 4, and

when l, m, and n are each an integer of 2 or more, two or morestructures in the parenthesis are the same as or different from eachother,

in Formula 3,

A1 and A2 are the same as or different from each other, and eachindependently a substituted or unsubstituted alkyl group; a substitutedor unsubstituted cycloalkyl group; a substituted or unsubstituted arylgroup; or a substituted or unsubstituted heterocyclic group,

L2 and L3 are the same as or different from each other, and eachindependently a direct bond; a substituted or unsubstituted arylenegroup; or a substituted or unsubstituted divalent heterocyclic group,

A is any one of the following substituted or unsubstituted structures,

X is O; S; or CT12T13,

o and p are an integer of 1 to 3, and

when o and p are an integer of 2 or more, two or more structures in theparenthesis are the same as or different from each other,

T1 to T8, T12, and T13 are the same as or different from each other, andeach independently hydrogen; deuterium; a halogen group; a nitrilegroup; a nitro group; a hydroxy group; a substituted or unsubstitutedalkyl group; a substituted or unsubstituted cycloalkyl group; asubstituted or unsubstituted alkoxy group; a substituted orunsubstituted aryloxy group; a substituted or unsubstituted alkylthioxygroup; a substituted or unsubstituted arylthioxy group; a substituted orunsubstituted alkylsulfoxy group; a substituted or unsubstitutedarylsulfoxy group; a substituted or unsubstituted alkenyl group; asubstituted or unsubstituted silyl group; a substituted or unsubstitutedboron group; a substituted or unsubstituted aryl group; or a substitutedor unsubstituted heterocyclic group, or combine with an adjacent groupto form a substituted or unsubstituted hydrocarbon ring or a substitutedor unsubstituted hetero ring,

in Formula 4,

q is an integer of 1 to 4,

r is an integer of 1 to 8, and

when q and r are an integer of 2 or more, two or more structures in theparenthesis are the same as or different from each other,

T9 and T10 are the same as or different from each other, and eachindependently hydrogen; deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a substituted or unsubstituted alkylgroup; a substituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group, or combine with an adjacent group toform a substituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring,

at least one of T9 and T10 has the following structure,

L4 is a direct bond; a substituted or unsubstituted arylene group; or asubstituted or unsubstituted divalent heterocyclic group,

X1 is O; S; or Se,

Ar4 and Ar5 are the same as or different from each other, and eachindependently a substituted or unsubstituted aryl group; or asubstituted or unsubstituted heterocyclic group,

in Formula 5,

L6 and L7 are the same as or different from each other, and eachindependently a direct bond; a substituted or unsubstituted arylenegroup; or a substituted or unsubstituted divalent heterocyclic group,

A′ is a substituted or unsubstituted pyrenylene group, and

Cz is a substituted or unsubstituted carbazole group.

Advantageous Effects

The organic light emitting diode according to an exemplary embodiment ofthe present specification provides low driving voltage and/or high lightemitting efficiency.

DESCRIPTION OF DRAWINGS

FIG. 1 is a view illustrating an organic light emitting diode accordingto an exemplary embodiment of the present specification.

FIG. 2 is a view illustrating an organic light emitting diode accordingto an exemplary embodiment of the present specification.

FIG. 3 is a view illustrating an organic light emitting diode accordingto an exemplary embodiment of the present specification.

FIG. 4 is a view illustrating an organic light emitting diode accordingto an exemplary embodiment of the present specification.

FIG. 5 is a view illustrating a result of measurement data of theHOMO(AC3) levels of Compound 1-6.

FIG. 6 is a view illustrating a result of measurement data of theHOMO(AC3) levels of Compound 1-8.

FIG. 7 is a view illustrating a result of measurement data of theHOMO(AC3) levels of Compound 1-30.

FIG. 8 is a view illustrating a result of measurement data of theHOMO(AC3) levels of Compound 1-138.

FIG. 9 is a view illustrating a result of measurement data of theHOMO(AC3) levels of Compound 2-5.

EXPLANATION OF REFERENCE NUMERALS AND SYMBOLS

-   -   101: Substrate    -   201: Anode    -   301, 302, 303: Hole transporting layer    -   401, 402, 403: Light emitting layer    -   501, 502: First electron transporting layer    -   601, 602: Second electron transporting layer    -   701: Cathode    -   801, 802: P-type organic material layer    -   901, 902: Charge generating layer    -   1001: Hole injection layer    -   1101: Electron transporting layer

BEST MODE

Hereinafter, the present specification will be described in more detail.

When one member is disposed “on” another member in the presentspecification, this includes not only a case where the one member is incontact with the another member, but also a case where still anothermember is present between the two members.

When one part “includes” one constituent element in the presentspecification, unless otherwise specifically described, this does notmean that another constituent element is excluded, but means thatanother constituent element may be further included.

The present specification provides an organic light emitting diodeincluding: a cathode; an anode; a light emitting layer provided betweenthe cathode and the anode; a first electron transporting layer includingthe heterocyclic compound represented by Formula 1 and provided betweenthe cathode and the light emitting layer; and a second electrontransporting layer including one or more host materials of compoundsrepresented by Formulae 3 to 5 and one or more dopants of alkali metalsand alkaline earth metals and provided between the cathode and the firstelectron transporting layer.

In an exemplary embodiment of the present specification, an organicmaterial layer including the heterocyclic compound represented byFormula 1 is the first electron transporting layer and provided moreadjacent to the light emitting layer than the second electrontransporting layer.

In an exemplary embodiment of the present specification, the secondelectron transporting layer is provided more adjacent to the cathodethan the first electron transporting layer.

The “adjacent” in the present specification means being relativelyclosely disposed. In this case, the present specification may include acase of being in physical contact with each other, and may also includea case where an additional organic material layer is provided betweenthe adjacent organic material layers.

In an exemplary embodiment of the present specification, the organiclight emitting diode emits blue fluorescent light.

In an exemplary embodiment of the present specification, the organiclight emitting diode emits white light.

In an exemplary embodiment of the present specification, the HOMO energylevel of the heterocyclic compound represented by Formula 1 is 6 eV ormore. In an exemplary embodiment of the present specification, the HOMOenergy level of the heterocyclic compound represented by Formula 1 is6.0 eV or more and 7.0 eV or less. According to an exemplary embodimentof the present specification, in the case of having a deep HOMO energylevel as in the compound represented by Formula 1, holes may beeffectively blocked from a light emitting layer, and thus, high lightemitting efficiency may be provided, and the stability of the diode maybe improved, and thus, a diode having a long service life may beprovided.

In an exemplary embodiment of the present specification, the lightemitting layer includes a host and a dopant, and the difference betweenthe HOMO energy level of the host and the HOMO energy level of theheterocyclic compound represented by Formula 1 is 0.2 eV or more. Asdescribed above, when the difference in HOMO energy level between thehost material of the light emitting layer and the heterocyclic compoundrepresented by Formula 1 is 0.2 eV or more, holes may be furthereffectively blocked from the light emitting layer, and thus, it ispossible to provide an organic light emitting diode having high lightemitting efficiency and a long service life.

In an exemplary embodiment of the present specification, an organicmaterial layer including the heterocyclic compound represented byFormula 1 is provided to be adjacent to the light emitting layer. Inthis case, holes may be effectively blocked by having a deeper HOMOenergy level than that of the host compound of the light emitting layer.

In the case of an organic light emitting diode which emits bluefluorescent light as in an exemplary embodiment of the presentspecification, an anthracene derivative is usually used as a hostmaterial, and in this case, the host material has a HOMO energy level ofless than 6 eV. Accordingly, when an organic material layer includingthe heterocyclic compound represented by Formula 1 is provided betweenthe cathode and the light emitting layer, it is possible tosimultaneously play a role of blocking a hole along with the transfer ofan electron.

In the present specification, the energy level means the size of energy.Accordingly, even when the energy level is expressed in the negative (−)direction from the vacuum level, it is interpreted that the energy levelmeans an absolute value of the corresponding energy value. For example,the HOMO energy level means the distance from the vacuum level to thehighest occupied molecular orbital.

In an exemplary embodiment of the present specification, the HOMO levelmay be measured by using an atmospheric pressure photoelectronspectrometer AC3 (manufactured by RIKEN KEIKI Co., Ltd.). Specifically,the HOMO level may be measured by irradiating light on a material, andmeasuring the amount of electron produced due to separation of a chargeat that time.

In an exemplary embodiment of the present specification, the tripletenergy of the heterocyclic compound represented by Formula 1 is 2.2 eVor more.

According to an exemplary embodiment of the present specification, inthe case of including the heterocyclic compound represented by Formula1, which has the triplet energy in various ranges, it is possible toexpect a diode having high efficiency and/or a long service life byeffectively blocking the triplet exciton of the light emitting layer inthe organic light emitting diode.

In an exemplary embodiment of the present specification, the lightemitting layer includes a host and a dopant, and the triplet energy ofthe heterocyclic compound represented by Formula 1 is larger than thatof the host.

In an exemplary embodiment of the present specification, the tripletenergy (E_(T)) may be measured by using the low temperaturephotoluminescence method. The triplet energy may be obtained bymeasuring the λ_(edge) value and using the following conversion formula.

E _(T)(eV)=1239.85/(λ_(edge))

When a phosphorescence spectrum is expressed by taking thephosphorescence intensity in the longitudinal axis and the wavelength inthe lateral axis, “λ_(edge) ^(”) in the conversion formula means awavelength value of a cross-section of a tangent line and the lateralaxis by drawing the tangent line with respect to an increase at theshort wavelength side of the phosphorescence spectrum, and the unitthereof is nm.

In another exemplary embodiment of the present specification, thetriplet energy (E_(T)) may also be obtained by the quantum chemicalcalculation. The quantum chemical calculation may be performed by usinga quantum chemical calculation program Gaussian 03 manufactured by U.S.Gaussian Corporation. In the calculation, the density functional theory(DFT) is used, and a calculated value of the triplet energy may beobtained by the time-dependent-density functional theory (TD-DFT) withrespect to a structure optimized using B3LYP as a functional and 6-31G*as a basis function.

In another exemplary embodiment of the present specification, thephosphorescence spectrum is not observed in a specific organic compoundin some cases, and in the organic compound, it is possible to assume anduse the triplet energy (E_(T)) obtained by using the quantum chemicalcalculation as shown above.

In an exemplary embodiment of the present specification, the dipolemoment of the heterocyclic compound represented by Formula 1 is 2 debyeor less. More preferably, the dipole moment of the heterocyclic compoundrepresented by Formula 1 is 1 debye or less.

In an exemplary embodiment of the present specification, the dipolemoment of a host material included in the second electron transportinglayer is 1 debye or more.

The dipole moment in the present specification is a physical quantitywhich indicates the degree of polarity, and may be calculated by thefollowing Equation 1.

$\begin{matrix}{{p(r)} = {\int\limits_{V}{{\rho \left( r_{0} \right)}\left( {r_{0} - r} \right)d^{3}r_{0}}}} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

-   -   ρ (r₀): molecular density    -   V: volume    -   r: the point of observation    -   d³r₀: an elementary volume

The value of the dipole moment may be obtained by calculating themolecular density in Equation 1. For example, the molecular density maybe obtained by using a method called Hirshfeld Charge Analysis to obtaina charge and a dipole for each atom and performing the calculationaccording to the following equations, and the dipole moment may beobtained by substituting the Equation 1 with the calculation result.

Weight Function

${W_{a}(r)} = {{\rho_{\alpha}\left( {r - R_{\alpha}} \right)}\left\lbrack {\sum\limits_{\beta}{\rho_{\beta}\left( {r - R_{\beta}} \right)}} \right\rbrack}^{- 1}$

-   -   ρ_(α)(r−R_(α)): spherically averaged ground-state amonic density

$\sum\limits_{\beta}{\rho_{\beta}\left( {r - R_{\beta}} \right)}$

promolecule density

Deformation Density

${\rho_{d}(r)} = {{\rho (r)} - {\sum\limits_{\alpha}{\rho_{\alpha}\left( {r - R_{\alpha}} \right)}}}$

-   -   ρ(r): molecular density    -   ρ_(α)(r−R₆₀): density of the free atom αlocated at coordinate        R_(α)

Atomic Charge

q(α)=−∫ρ_(d)(r)W _(α)(r)d ³ r

-   -   W_(α)(r): Weight function

The organic light emitting diode having the aforementioned dipole momentvalue range may provide low driving voltage and high light emittingefficiency because the capability of injecting and transportingelectrons introduced from the cathode is improved. Further, thearrangement of the molecules in the organic light emitting diode isexcellent, thereby providing a dense and compact film. Accordingly, anorganic light emitting diode including the electron transportingmaterial is excellent in stability, and thus, may provide an organiclight emitting diode having a long service life.

In an exemplary embodiment of the present specification, the electronmobility of the heterocyclic compound represented by Formula 1 is 10⁻⁶cm²/Vs or more.

In another exemplary embodiment, the electron mobility of theheterocyclic compound represented by Formula 1 is 10⁻⁶ cm²/Vs or moreunder an electric field condition of 0.1 to 0.5 MV/cm. In still anotherexemplary embodiment, the electron mobility of the heterocyclic compoundrepresented by Formula 1 is 10⁻⁶ cm²/Vs or more under an electric fieldcondition of 0.1 MV/cm. In this case, the number of excitons produced inthe light emitting layer is increased, and thus, a high efficiency maybe expected.

In the present specification, the electron mobility may be measured by amethod used in the art. Specifically, a time of flight (TOF) or a methodof measuring a space charge limited current (SCLC) may be used, and themethod is not limited thereto.

Specifically, in an exemplary embodiment of the present specification,bathophenanthroline and lithium (2%) were heated under vacuum on an ITOsubstrate and deposited to have a thickness of 20 nm, and then thecompound was deposited to have a thickness of 200 nm.Bathophenanthroline and lithium (2%) were heated under vacuum on thelayer and deposited to have a film having a thickness of 20 nm, and thenaluminum was deposited to have a thickness of 100 nm or more, therebypreparing a sample. The electron mobility in the space charge limitedcurrent (SCLC) region may be calculated by measuring the currentlydensity (mA/cm²) for the voltage of the sample.

In an exemplary embodiment of the present specification, the firstelectron transporting layer further includes an n-type dopantrepresented by the following Formula 10.

A3 is hydrogen; deuterium; a halogen group; a nitrile group; a nitrogroup; a hydroxy group; a substituted or unsubstituted alkyl group; asubstituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group,

the curved line represents a bond required for forming a 5-membered or6-membered ring having M, and two or three atoms, and the atom isunsubstituted or substituted with a substituent which is the same as thedefinition of one or two or more A's, and

M is an alkali metal or an alkaline earth metal.

In an exemplary embodiment of the present specification, the n-typedopant represented by Formula 10 is represented by the following Formula10-1 or 10-2.

In Formulae 10-1 and 10-2,

M is the same as that defined in Formula 10, and

Formulae 10-1 and 10-2 are each independently unsubstituted orsubstituted with one or two or more substituents selected from the groupconsisting of hydrogen; deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a substituted or unsubstituted alkylgroup; a substituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; and a substituted orunsubstituted heterocyclic group, or adjacent substituents combine witheach other to form a substituted or unsubstituted hydrocarbon ring or asubstituted or unsubstituted hetero ring.

In an exemplary embodiment of the present specification, the n-typedopant represented by Formula 10 may be any one of the followingstructures.

The structure may be unsubstituted or substituted with one or two ormore substituents selected from the group consisting of hydrogen;deuterium; a halogen group; a nitrile group; a nitro group; a hydroxygroup; a substituted or unsubstituted alkyl group; a substituted orunsubstituted cycloalkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted aryloxy group; a substituted orunsubstituted alkylthioxy group; a substituted or unsubstitutedarylthioxy group; a substituted or unsubstituted alkylsulfoxy group; asubstituted or unsubstituted arylsulfoxy group; a substituted orunsubstituted alkenyl group; a substituted or unsubstituted silyl group;a substituted or unsubstituted boron group; a substituted orunsubstituted aryl group; and a substituted or unsubstitutedheterocyclic group.

In an exemplary embodiment of the present specification, when theorganic alkali metal compound or the organic alkaline earth metalcompound represented by Formula 10 is used as the n-type dopant, thecompound may serve to prevent the diffusion of the metal dopant used inthe second electron transporting layer, may secure stability to theholes from the light emitting layer, and thus, may improve the servicelife of the organic light emitting diode. In addition, for the electronmobility of the first electron transporting layer, the balance of holesand electrons in the light emitting layer may be maximized bycontrolling the ratio of the organic alkali metal compound or theorganic alkaline earth metal compound, thereby increasing the lightemitting efficiency. Accordingly, it is more preferred to include theorganic alkali metal compound or the organic alkaline earth metalcompound as the n-type dopant in the first electron transporting layerin view of the service life of the diode.

In the present specification, as the n-type dopant used in the firstelectron transporting layer, Liq is more preferred.

In an exemplary embodiment of the present specification, the n-typedopant of the organic alkali metal compound or the organic alkalineearth metal compound, which is represented by Formula 10, is present inan amount of 10 wt % to 90 wt % based on the total weight of the firstelectron transporting layer. Preferably, the n-type dopant of theorganic alkali metal compound or the organic alkaline earth metalcompound, which is represented by Formula 10, is present in an amount of20 wt % to 80 wt % based on the total weight of the first electrontransporting layer.

The first electron transporting layer may include the heterocycliccompound represented by Formula 1 and the n-type dopant represented byFormula 10 at a weight ratio of 1:9 to 9:1. Preferably, the firstelectron transporting layer may include the heterocyclic compound ofFormula 1 and the n-dopant of Formula 10 at a weight ratio of 2:8 to8:2, and more preferably at a weight ratio of 3:7 to 7:3.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes one or two or more n-type dopantsselected from alkali metals and alkaline earth metals.

According to an exemplary embodiment of the present specification, thecompound represented by Formula 1 and the n-type dopant may be stackedon an organic light emitting diode at a weight ratio of 9:1 to 1:9.

Specifically, the second electron transporting layer may further includeone or two or more n-type dopants selected from the group consisting ofalkali metals of Li, Na, K, Rb, Cs or Fr and alkaline earth metals ofBe, Mg, Ca, Sr, Ba or Ra.

In an exemplary embodiment of the present specification, the n-typedopant of the second electron transporting layer is Li.

In another exemplary embodiment, the n-type dopant of the secondelectron transporting layer is Ca.

According to an exemplary embodiment of the present specification, then-type dopant of the alkali metal or the alkaline earth metal may beincluded in an amount in a range of 0.1 wt % to 20 wt % based on thetotal weight of the second electron transporting layer.

According to an exemplary embodiment of the present specification, thefirst electron transporting layer includes the compound represented byFormula 1 as the host and Liq as the n-type dopant, and the secondelectron transporting layer includes the one or more compounds selectedfrom Formulae 3 to 5 as the host and the alkali metal and/or thealkaline earth metal as the n-type dopant.

In this case, electrons are smoothly injected into the electrode, andthus, it is possible to implement an organic light emitting diode havinglow driving voltage. Furthermore, when the second electron transportinglayer, which is the n-type organic material layer, and the p-typeorganic material layer form an NP junction, electrons are smoothlyproduced from the p-type organic material layer to the second electrontransporting layer, and thus, it is possible to implement an organiclight emitting diode having an effective tandem structure.

Specifically, the first electron transporting layer of the compoundrepresented by Formula 1 is provided to be adjacent to the lightemitting layer, and thus, it is possible to prevent the triplet excitonsfrom migrating out of the light emitting layer, and the second electrontransporting layer is provided to be adjacent to the cathode, and thusit is possible to increase the density of the triplet excitons.Accordingly, the organic light emitting diode according to an exemplaryembodiment of the present specification induces an effect oftransporting and injecting the electrons and the focusing of the tripletexcitons, thereby providing low driving voltage and high efficiency.

In an exemplary embodiment of the present specification, the firstelectron transporting layer is provided to be adjacent to the lightemitting layer. In another exemplary embodiment, the second electrontransporting layer is provided to be adjacent to the cathode.

In this case, the transfer of electrons and the focusing of the tripletexcitons may be efficiently achieved.

In the present specification, the n-dopant means a material which allowsa host material to have n-semiconductor characteristics. Then-semiconductor characteristics means characteristics that electrons areinjected or transported at the lowest unoccupied molecular orbit (LUMO)energy level, that is, characteristics of a material having a largeelectron conductivity.

The organic light emitting diode according to an exemplary embodiment ofthe present specification includes a first electron transporting layerwhich includes the heterocyclic compound represented by Formula 1 as thehost between the light emitting layer and the cathode, and Liq havingthe structure as the n-type dopant.

In an exemplary embodiment of the present specification, the organiclight emitting diode may further include a hole blocking layer betweenthe aforementioned first electron transporting layer and the lightemitting layer.

Examples of the substituents will be described below, but the presentspecification is not limited thereto.

The term “substitution” means that a hydrogen atom bonded to a carbonatom of a compound is changed into another substituent, and a positionto be substituted is not limited as long as the position is a positionat which the hydrogen atom is substituted, that is, a position at whichthe substituent may be substituted, and when two or more aresubstituted, the two or more substituents may be the same as ordifferent from each other.

In the present specification, the term “substituted or unsubstituted”means being substituted with one or two or more substituents selectedfrom the group consisting of deuterium; a halogen group; a nitrilegroup; a nitro group; an imide group; an amide group; a hydroxy group; asubstituted or unsubstituted alkyl group; a substituted or unsubstitutedcycloalkyl group; a substituted or unsubstituted alkoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted amine group; a substituted or unsubstituted aryl group;and a substituted or unsubstituted heterocyclic group or beingsubstituted with a substituent to which two or more substituents arelinked among the substituents exemplified above, or having nosubstituent. For example, “the substituent to which two or moresubstituents are linked” may be a biphenyl group. That is, the biphenylgroup may also be an aryl group, and may be interpreted as a substituentto which two phenyl groups are linked.

In an exemplary embodiment of the present specification, the“substituted or unsubstituted” may be interpreted as being unsubstitutedor substituted with one or more substituents selected from the groupconsisting of deuterium; a halogen group; a nitrile group; a hydroxygroup; a carbonyl group; an ester group; an alkoxy group; an aryloxygroup; an alkylthioxy group; an arylthioxy group; an alkylsulfoxy group;an arylsulfoxy group; a silyl group; an alkyl group; a cycloalkyl group;an alkenyl group; an aryl group; an aralkyl group; an aralkenyl group;and an alkylaryl group.

According to an exemplary embodiment of the present specification, it ismore preferred that the expression “substituted or unsubstituted” isunsubstituted or substituted with one or more substituents selected fromthe group consisting of deuterium; an alkyl group; and an aryl group.

In an exemplary embodiment of the present specification, the hydrogenatom of the heterocyclic compound represented by Formula 1 may bedeuterium. That is, the heterocyclic compound represented by Formula 1according to an exemplary embodiment of the present specification mayinclude one or more deuteriums. The meaning of including deuterium alsoincludes the case where the substituent of the heterocyclic compounditself may also be deuterium, and the case where the substituent of theheterocyclic compound is substituted with deuterium. In the presentspecification, the halogen group may be fluorine, chlorine, bromine oriodine.

In the present specification, the alkyl group may be straight-chained orbranched, and the number of carbon atoms thereof is not particularlylimited, but is preferably 1 to 40. According to an exemplaryembodiment, the number of carbon atoms of the alkyl group is 1 to 20.According to another exemplary embodiment, the number of carbon atoms ofthe alkyl group is 1 to 10. According to still another exemplaryembodiment, the number of carbon atoms of the alkyl group is 1 to 6.Specific examples of the alkyl group include methyl, ethyl, propyl,n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec-butyl,1-methyl-butyl, 1-ethyl-butyl, pentyl, n-pentyl, isopentyl, neopentyl,tert-pentyl, hexyl, n-hexyl, 1-methylpentyl, 2-methylpentyl,4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, heptyl, n-heptyl,1-methylhexyl, cyclopentylmethyl, cyclohexylmethyl, octyl, n-octyl,tert-octyl, 1-methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl,2,2-dimethylheptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl,2-methylpentyl, 4-methylhexyl, 5-methylhexyl, and the like, but are notlimited thereto.

In the present specification, the cycloalkyl group is not particularlylimited, but has preferably 3 to 60 carbon atoms, and according to anexemplary embodiment, the number of carbon atoms of the cycloalkyl groupis 3 to 30. According to another exemplary embodiment, the number ofcarbon atoms of the cycloalkyl group is 3 to 20. According to stillanother exemplary embodiment, the number of carbon atoms of thecycloalkyl group is 3 to 6. Specifically, examples thereof includecyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl,2,3-dimethylcyclopentyl, cyclohexyl, 3-methylcyclohexyl,4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,4,5-trimethylcyclohexyl,4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, and the like, but arenot limited thereto.

In the present specification, the alkoxy group may be straight-chained,branched, or cyclic. The number of carbon atoms of the alkoxy group isnot particularly limited, but is preferably 1 to 20. Specific examplesthereof include methoxy, ethoxy, n-propoxy, isopropoxy, i-propyloxy,n-butoxy, isobutoxy, tert-butoxy, sec-butoxy, n-pentyloxy, neopentyloxy,isopentyloxy, n-hexyloxy, 3,3-dimethylbutyloxy, 2-ethylbutyloxy,n-octyloxy, n-nonyloxy, n-decyloxy, benzyloxy, p-methylbenzyloxy, andthe like, but are not limited thereto.

In the present specification, the alkenyl group may be straight-chainedor branched, and the number of carbon atoms thereof is not particularlylimited, but is preferably 2 to 40. According to an exemplaryembodiment, the number of carbon atoms of the alkenyl group is 2 to 20.According to another exemplary embodiment, the number of carbon atoms ofthe alkenyl group is 2 to 10. According to still another exemplaryembodiment, the number of carbon atoms of the alkenyl group is 2 to 6.Specific examples thereof include vinyl, 1-propenyl, isopropenyl,1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl,3-methyl-1-butenyl, 1,3-butadienyl, allyl, 1-phenylvinyl-1-yl,2-phenylvinyl-1-yl, 2,2-diphenylvinyl-1-yl,2-phenyl-2-(naphthyl-1-yl)vinyl-1-yl, 2,2-bis(diphenyl-1-yl)vinyl-1-yl,a stilbenyl group, a styrenyl group, and the like, but are not limitedthereto.

In the present specification, specific examples of the silyl groupinclude a trimethylsilyl group, a triethylsilyl group, at-butyldimethylsilyl group, a vinyldimethylsilyl group, apropyldimethylsilyl group, a triphenylsilyl group, a diphenylsilylgroup, a phenylsilyl group, and the like, but are not limited thereto.

In the present specification, specific examples of the boron groupinclude a trimethylboron group, a triethylboron group, at-butyldimethylboron group, a triphenylboron group, a phenylboron group,and the like, but are not limited thereto.

In the present specification, the aryl group is not particularlylimited, but has preferably 6 to 60 carbon atoms, and may be amonocyclic aryl group or a polycyclic aryl group. According to anexemplary embodiment, the number of carbon atoms of the aryl group is 6to 30. According to an exemplary embodiment, the number of carbon atomsof the aryl group is 6 to 20. When the aryl group is a monocyclic arylgroup, the aryl group may be a phenyl group, a biphenyl group, aterphenyl group, a quarterphenyl group, and the like, but is not limitedthereto. When the aryl group is a polycyclic aryl group, the aryl groupmay be a naphthyl group, an anthracenyl group, a phenanthryl group, apyrenyl group, a perylenyl group, a chrysenyl group, a fluorenyl group,and the like, but are not limited thereto.

In the present specification, the fluorenyl group may be substituted,and two substituents may combine with each other to form a spirostructure.

When the fluorenyl group is substituted, the fluorenyl group may be

and the like, but is not limited thereto.

In the present specification, the heterocyclic group is a heterocyclicgroup including one or more of O, N, S, Si, and Se as a hetero element,and the number of carbon atoms thereof is not particularly limited, butis preferably 2 to 60. Examples of the heterocyclic group include athiophene group, a furan group, a pyrrole group, an imidazole group, atriazole group, an oxazole group, an oxadiazole group, a triazole group,a pyridyl group, a bipyridyl group, a pyrimidyl group, a triazine group,a triazole group, an acridyl group, a pyridazine group, a pyrazinylgroup, a qinolinyl group, a quinazoline group, a quinoxalinyl group, aphthalazinyl group, a pyridopyrimidinyl group, a pyridopyrazinyl group,a pyrazinopyrazinyl group, an isoquinoline group, an indole group, acarbazole group, a benzoxazole group, a benzimidazole group, abenzothiazole group, a benzocarbazole group, a benzothiophene group, adibenzothiophene group, a benzofuranyl group, a phenanthroline group, athiazolyl group, an isoxazolyl group, an oxadiazolyl group, athiadiazolyl group, a benzothiazolyl group, a phenothiazinyl group, adibenzofuranyl group, and the like, but are not limited thereto.

The heterocyclic group may be monocyclic or polycyclic, and may be anaromatic ring, an aliphatic ring, or a condensed ring of the aromaticring and the aliphatic ring.

In the present specification, the description on the above-describedaryl group may be applied to an aryl group of an aryloxy group, anarylthioxy group, and an arylsulfoxy group.

In the present specification, the description on the above-describedalkyl group may be applied to an alkyl group of an alkylthioxy group andan alkylsulfoxy group.

In the present specification, the description on the above-describedaryl group may be applied to an arylene group except for a divalentarylene group.

In the present specification, the “adjacent” group may mean asubstituent substituted with an atom directly linked to an atom in whichthe corresponding substituent is substituted, a substituent disposedsterically closest to the corresponding substituent, or anothersubstituent substituted with an atom in which the correspondingsubstituent is substituted. For example, two substituents substituted atthe ortho position in a benzene ring and two substituents substitutedwith the same carbon in an aliphatic ring may be interpreted as groupswhich are “adjacent” to each other.

In the present specification, an alkylene, which is unsubstituted orsubstituted with two adjacent hydrocarbons or hetero rings, or analkenylene, which is unsubstituted or substituted with a hydrocarbon ora hetero ring, may combine with each other to form a ring. In thepresent specification, the ring formed by combining the adjacent groupswith each other may be monocyclic or polycyclic, may be any of analiphatic ring, an aromatic ring, or a condensed ring of the aliphaticring and the aromatic ring, and may form a hydrocarbon ring or heteroring.

In the present specification, the meaning of combining with an adjacentgroup to form a ring means of combining with an adjacent group to form asubstituted or unsubstituted aliphatic hydrocarbon ring; a substitutedor unsubstituted aromatic hydrocarbon ring; a substituted orunsubstituted aliphatic hetero ring; a substituted or unsubstitutedaromatic hetero ring; and a condensed ring thereof.

The hydrocarbon ring may be selected from the example of the cycloalkylgroup or the aryl group, except for the hydrocarbon ring which is notmonovalent. The hetero ring may be any of an aromatic ring, an aliphaticring, or a condensed ring of the aromatic ring and the aliphatic ring,and may be selected from the example of the heterocyclic group, exceptfor the hetero ring which is not monovalent.

In the present specification, the “spiro bond” may mean a structure inwhich substituents in the same carbon combine with each other, and tworing compounds are linked to each other through one atom.

In an exemplary embodiment of the present specification, theheterocyclic compound represented by Formula 1 may be represented by thefollowing Formula 1-A.

In Formula 1-A,

the definition of Ar1, Ar2, L1, R1 to R4, l, m, and n is the same asdefined in Formula 1.

One of the important characteristics of an organic material used in theorganic light emitting diode is that an amorphous deposition film needsto be formed. An organic material having high crystallinity has adisadvantage in that a film is non-uniformly deposited during thedeposition, and thus, the driving voltage is largely increased when adiode is driven, and the service life of the diode is decreased, andthus the diode quickly deteriorates. In order to alleviate thedisadvantage, an amorphous film needs to be formed.

Thus, the present inventors have confirmed that an asymmetric materialin a triazine derivative structure does not exhibit crystallinity. In anexemplary embodiment of the present specification, for the heterocycliccompound represented by Formula 1, Ar1 to Ar3, which are a substituentof triazine, are different from each other. In this case, theheterocyclic compound may provide a diode which is capable of forming anamorphous deposition film because the substituents of triazine areasymmetric, and has a low driving voltage and long service life.

In an exemplary embodiment of the present specification, for theheterocyclic compound represented by Formula 1, Ar1 to Ar3, which are asubstituent of triazine, are different from each other.

According to an exemplary embodiment of the present specification,Formula 1 may be represented by any one of the following Formulae 1-A-1to 1-A-4.

In Formulae 1-A-1 to 1-A-4,

the definition of Ar1, Ar2, L1, R1 to R4, l, m, and n is the same asdefined in Formula 1.

In an exemplary embodiment of the present specification, theheterocyclic compound represented by Formula 1 may be represented byFormula 1-A-1.

In another exemplary embodiment, the heterocyclic compound representedby Formula 1 is represented by Formula 1-A-2.

In still another exemplary embodiment, the heterocyclic compoundrepresented by Formula 1 is represented by Formula 1-A-3.

In yet another exemplary embodiment, the heterocyclic compoundrepresented by Formula 1 is represented by Formula 1-A-4.

The heterocyclic compound serving as an electron transporting layer inthe present specification is preferably the compound represented byFormula 1-A-1 in terms of light emitting efficiency and service life.

In an exemplary embodiment of the present specification, theheterocyclic compound represented by Formula 1 is represented by thefollowing Formula 1-B.

The definition of R1 to R4, Ar1, L1, l, m, and n is the same as definedin Formula 1.

x1 is an integer of 1 to 5, and

x2 is an integer of 1 to 4, and

when x1 and x2 are an integer of 2 or more, two or more structures inthe parenthesis are the same as or different from each other, and

X1 and X2 are the same as or different from each other, and eachindependently hydrogen; deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a substituted or unsubstituted alkylgroup; a substituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group, or two or more adjacent groups combinewith each other to form a substituted or unsubstituted hydrocarbon ring;or a substituted or unsubstituted hetero ring.

In an exemplary embodiment of the present specification, theheterocyclic compound represented by Formula 1 is represented by thefollowing Formula 1-B-1.

In Formula 1-B-1,

R1 to R4, Ar1, L1, l, m, n, x1, x2, X1, and X2 are the same as thosedefined in Formula 1-B.

In an exemplary embodiment of the present specification, X1 is hydrogen.

In another exemplary embodiment, X2 is hydrogen.

When Ar1 or Ar2 includes a biphenyl group as in an exemplary embodimentof the present specification, there is an excellent effect in terms ofservice life of the diode. According to an exemplary embodiment of thepresent specification, Ar1 and Ar2 are different from each other, andeach independently a substituted or unsubstituted aryl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently an arylgroup of substituted or unsubstituted 1-membered to 4-membered ring.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently an arylgroup, which is unsubstituted or substituted with one or moresubstituents selected from the group consisting of deuterium; a halogengroup; a nitrile group; a nitro group; a hydroxy group; a carbonylgroup; an ester group; an imide group; an amino group; a phosphine oxidegroup, an alkoxy group; an aryloxy group; an alkylthioxy group; anarylthioxy group; an alkylsulfoxy group; an arylsulfoxy group; a silylgroup; a boron group; an alkyl group; a cycloalkyl group; an alkenylgroup; an aryl group; an aralkyl group; an aralkenyl group; an alkylarylgroup; an alkylamine group; an aralkylamine group; a heteroarylaminegroup; an arylamine group; an arylphosphine group; and a heterocyclicgroup.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently an arylgroup, which is unsubstituted or substituted with one or moresubstituents selected from the group consisting of deuterium, an alkylgroup, and an aryl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently asubstituted or unsubstituted aryl group, and at least one of Ar1 and Ar2is an aryl group, which is unsubstituted or substituted with deuterium.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently an arylgroup, which is unsubstituted or substituted with deuterium.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently asubstituted or unsubstituted phenyl group; a substituted orunsubstituted naphthyl group; a substituted or unsubstituted biphenylgroup; a substituted or unsubstituted terphenyl group; a substituted orunsubstituted quarterphenyl group; a substituted or unsubstitutedphenanthryl group; a substituted or unsubstituted chrysenyl group; asubstituted or unsubstituted fluorenyl group; or a substituted orunsubstituted heteroaryl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently a phenylgroup; a naphthyl group; a biphenyl group; a terphenyl group; aquarterphenyl group; a phenanthryl group; a chrysenyl group; a fluorenylgroup; or a heteroaryl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently asubstituted or unsubstituted phenyl group; a substituted orunsubstituted naphthyl group; a substituted or unsubstituted biphenylgroup; a substituted or unsubstituted terphenyl group; a substituted orunsubstituted quarterphenyl group; a substituted or unsubstitutedphenanthryl group; a substituted or unsubstituted chrysenyl group; or asubstituted or unsubstituted heteroaryl group.

In an exemplary embodiment of the present specification, Ar1 and Ar2 aredifferent from each other, and each independently a phenyl group, whichis unsubstituted or substituted with an aryl group; a biphenyl group,which is unsubstituted or substituted with an aryl group; a terphenylgroup, which is unsubstituted or substituted with an aryl group; aquarterphenyl group, which is unsubstituted or substituted with an arylgroup; a naphthyl group, which is unsubstituted or substituted with anaryl group; or a phenanthryl group, which is unsubstituted orsubstituted with an aryl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently a phenylgroup; a naphthyl group; a biphenyl group; a terphenyl group; aquarterphenyl group; a phenanthryl group; a chrysenyl group; or aheteroaryl group. According to an exemplary embodiment of the presentspecification, Ar1 is a substituted or unsubstituted phenyl group; asubstituted or unsubstituted biphenyl group; a substituted orunsubstituted naphthyl group; or a substituted or unsubstitutedphenanthryl group.

According to an exemplary embodiment of the present specification, Ar1is a phenyl group; a biphenyl group; a naphthyl group; or a phenanthrylgroup.

According to an exemplary embodiment of the present specification, Ar1is a substituted or unsubstituted phenyl group.

According to an exemplary embodiment of the present specification, Ar1is a substituted or unsubstituted biphenyl group.

According to an exemplary embodiment of the present specification, Ar1is a substituted or unsubstituted naphthyl group.

According to an exemplary embodiment of the present specification, Ar1is a substituted or unsubstituted phenanthryl group.

According to an exemplary embodiment of the present specification, whenAr1 is a substituted or unsubstituted phenyl group, Ar2 is a substitutedor unsubstituted biphenyl group; a substituted or unsubstitutedterphenyl group; a substituted or unsubstituted quarterphenyl group; asubstituted or unsubstituted naphthyl group; a substituted orunsubstituted phenanthryl group; or a substituted phenyl group.

According to an exemplary embodiment of the present specification, whenAr1 is a phenyl group, Ar2 is a biphenyl group; a terphenyl group; aterphenyl group substituted with a phenyl group; a quarterphenyl group;a naphthyl group; a phenanthryl group; or a phenyl group substitutedwith a naphthyl group.

According to an exemplary embodiment of the present specification, whenAr1 is a substituted or unsubstituted biphenyl group, Ar2 is asubstituted or unsubstituted terphenyl group; a substituted orunsubstituted biphenyl group; a substituted phenyl group; a substitutedor unsubstituted naphthyl group; or a substituted or unsubstitutedphenanthryl group.

According to an exemplary embodiment of the present specification, whenAr1 is a biphenyl group, Ar2 is a terphenyl group; a biphenyl group; aphenyl group substituted with a naphthyl group; a phenyl groupsubstituted with a phenanthryl group; a biphenyl group substituted witha naphthyl group; a naphthyl group; a naphthyl group substituted with aphenyl group; or a phenanthryl group.

According to an exemplary embodiment of the present specification, whenAr1 is a substituted or unsubstituted naphthyl group, Ar2 is asubstituted or unsubstituted biphenyl group; a substituted phenyl group;a substituted or unsubstituted terphenyl group; a substituted orunsubstituted phenanthryl group; or a substituted or unsubstitutedquarterphenyl group.

According to an exemplary embodiment of the present specification, whenAr1 is a naphthyl group, Ar2 is a biphenyl group; a phenyl groupsubstituted with a naphthyl group; a phenyl group substituted with aphenanthryl group; a terphenyl group; a biphenyl group substituted witha naphthyl group; a phenanthryl group substituted with a phenyl group; aphenanthryl group; a quarterphenyl group; or a terphenyl groupsubstituted with a phenyl group.

According to an exemplary embodiment of the present specification, whenAr1 is a substituted or unsubstituted phenanthryl group, Ar2 is asubstituted or unsubstituted biphenyl group; a substituted phenyl group;a substituted or unsubstituted terphenyl group; or a substituted orunsubstituted quarterphenyl group.

According to an exemplary embodiment of the present specification, whenAr1 is a phenanthryl group, Ar2 is a biphenyl group; a phenyl groupsubstituted with a phenanthryl group; a phenyl group substituted with anaphthyl group; a terphenyl group; a quarterphenyl group; or a terphenylgroup substituted with a phenyl group.

According to an exemplary embodiment of the present specification, Ar2is a substituted or unsubstituted phenyl group; a substituted orunsubstituted biphenyl group; a substituted or unsubstituted terphenylgroup; a substituted or unsubstituted quarterphenyl group; a substitutedor unsubstituted naphthyl group; or a substituted or unsubstitutedphenanthryl group.

According to an exemplary embodiment of the present specification, Ar2is a phenyl group; a biphenyl group; a terphenyl group; a quarterphenylgroup; a naphthyl group; or a phenanthryl group.

According to an exemplary embodiment of the present specification, atleast one of Ar1 and Ar2 is a substituted or unsubstituted biphenylgroup.

According to an exemplary embodiment of the present specification, Ar1is a phenyl group, which is unsubstituted or substituted with an arylgroup; a biphenyl group, which is unsubstituted or substituted with anaryl group; a naphthyl group, which is unsubstituted or substituted withan aryl group; or a phenanthryl group, which is unsubstituted orsubstituted with an aryl group, and Ar2 is a phenyl group, which isunsubstituted or substituted with an aryl group; a biphenyl group, whichis unsubstituted or substituted with an aryl group; a terphenyl group,which is unsubstituted or substituted with an aryl group; aquarterphenyl group, which is unsubstituted or substituted with an arylgroup; a naphthyl group, which is unsubstituted or substituted with anaryl group; or a phenanthryl group, which is unsubstituted orsubstituted with an aryl group.

According to an exemplary embodiment of the present specification, Ar1is a phenyl group, and Ar2 is a biphenyl group.

According to an exemplary embodiment of the present specification, Ar1and Ar2 are different from each other, and each independently a phenylgroup; a biphenyl group; a terphenyl group; a naphthyl group; aphenanthryl group; or a phenyl group substituted with a naphthyl group.

According to an exemplary embodiment of the present specification, R1 ishydrogen; a substituted or unsubstituted alkyl group; or a substitutedor unsubstituted aryl group.

According to an exemplary embodiment of the present specification, R1 ishydrogen; a substituted or unsubstituted alkyl group having 1 to 30carbon atoms; or a substituted or unsubstituted aryl group having 6 to40 carbon atoms.

According to an exemplary embodiment of the present specification, R1 ishydrogen; a substituted or unsubstituted alkyl group having 1 to 6carbon atoms; or a substituted or unsubstituted aryl group having 6 to20 carbon atoms, or two or more adjacent R1's combine with each other toform a substituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring.

According to an exemplary embodiment of the present specification, R1 ishydrogen; deuterium; an alkyl group having 1 to 6 carbon atoms; or anaryl group having 6 to 20 carbon atoms, or two or more adjacent R1'scombine with each other to form a substituted or unsubstitutedhydrocarbon ring or a substituted or unsubstituted hetero ring.

According to an exemplary embodiment of the present specification, R1 ishydrogen; deuterium; or an alkyl group. According to an exemplaryembodiment of the present specification, R1 is hydrogen.

In an exemplary embodiment of the present specification, two or moreR1's combine with each other to form a substituted or unsubstitutedhydrocarbon ring.

In another exemplary embodiment, the two or more adjacent R1's combinewith each other to form a substituted or unsubstituted benzene ring.

In an exemplary embodiment of the present specification, the two or moreadjacent R1's combine with each other to form a benzene ring.

According to an exemplary embodiment of the present specification, R2 ishydrogen; deuterium; a halogen group; a nitrile group; a nitro group; ahydroxy group; a substituted or unsubstituted alkyl group; a substitutedor unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted aryloxy group; a substituted orunsubstituted alkylthioxy group; a substituted or unsubstitutedarylthioxy group; a substituted or unsubstituted alkylsulfoxy group; asubstituted or unsubstituted arylsulfoxy group; a substituted orunsubstituted alkenyl group; a substituted or unsubstituted silyl group;a substituted or unsubstituted boron group; a substituted orunsubstituted aryl group; a substituted or unsubstituted monocyclic orbicyclic heterocyclic group including one or more of O and S atoms; asubstituted or unsubstituted pyrrole group; a substituted orunsubstituted imidazole group; a substituted or unsubstituted triazolegroup; a substituted or unsubstituted pyridyl group; a substituted orunsubstituted bipyridyl group; a substituted or unsubstituted pyrimidylgroup; a substituted or unsubstituted triazole group; a substituted orunsubstituted acridyl group; a substituted or unsubstituted pyridazinegroup; a substituted or unsubstituted pyrazinyl group; a substituted orunsubstituted quinolinyl group; a substituted or unsubstitutedquinazoline group; a substituted or unsubstituted quinoxalinyl group; asubstituted or unsubstituted phthalazinyl group; a substituted orunsubstituted pyridopyrimidinyl group; a substituted or unsubstitutedpyridopyrazinyl group; a substituted or unsubstituted pyrazinopyrazinylgroup; a substituted or unsubstituted isoquinoline group; a substitutedor unsubstituted indole group; a substituted or unsubstitutedbenzimidazole group; or a substituted or unsubstituted phenanthrolinegroup, or two or more adjacent R2's combine with each other to form asubstituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring.

According to an exemplary embodiment of the present specification, R2 ishydrogen; a substituted or unsubstituted alkyl group; a substituted orunsubstituted aryl group; or a substituted or unsubstituted heterocyclicgroup, or two or more adjacent R2's combine with each other to form asubstituted or unsubstituted hydrocarbon ring.

According to an exemplary embodiment of the present specification, R2 ishydrogen; deuterium; a substituted or unsubstituted alkyl group having 1to 20 carbon atoms; a substituted or unsubstituted aryl group having 6to 20 carbon atoms; or a substituted or unsubstituted heterocyclic grouphaving 2 to 20 carbon atoms, or two or more adjacent R2's combine witheach other to form a substituted or unsubstituted hydrocarbon ring.

According to an exemplary embodiment of the present specification, R2 ishydrogen; deuterium; or a substituted or unsubstituted aryl group having6 to 40 carbon atoms.

According to an exemplary embodiment of the present specification, R2 ishydrogen; deuterium; or a substituted or unsubstituted aryl group having6 to 20 carbon atoms.

According to an exemplary embodiment of the present specification, R2 ishydrogen; or an aryl group having 6 to 20 carbon atoms.

According to an exemplary embodiment of the present specification, R2 ishydrogen; or a substituted or unsubstituted phenyl group.

According to an exemplary embodiment of the present specification, R2 ishydrogen; deuterium; or a phenyl group. According to an exemplaryembodiment of the present specification, R2 is hydrogen; or deuterium.

According to an exemplary embodiment of the present specification, R2 ishydrogen.

In an exemplary embodiment of the present specification, R2 is asubstituted or unsubstituted phenyl group.

In another exemplary embodiment, R2 is a phenyl group.

In an exemplary embodiment of the present specification, the two or moreR2's combine with each other to form a substituted or unsubstitutedhydrocarbon ring.

In another exemplary embodiment, the two or more adjacent R2's combinewith each other to form a substituted or unsubstituted benzene ring.

In an exemplary embodiment of the present specification, the two or moreadjacent R2's combine with each other to form a benzene ring.

In another exemplary embodiment, R1 is hydrogen; or adjacent groupscombine with each other to form a benzene ring.

In still another exemplary embodiment, R2 is hydrogen.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently hydrogen; deuterium; a halogen group; a substituted orunsubstituted, straight-chained alkyl group having 1 to 40 carbon atoms;a substituted or unsubstituted, straight-chained alkoxy group having 1to 40 carbon atoms; a substituted or unsubstituted, straight-chainedthioalkyl group having 1 to 40 carbon atoms; a substituted orunsubstituted, branched mono or poly cycloalkyl group having 3 to 40carbon atoms; a substituted or unsubstituted, branched alkenyl grouphaving 3 to 40 carbon atoms; a substituted or unsubstituted, branchedalkoxy group having 3 to 40 carbon atoms; a substituted orunsubstituted, branched thioalkoxy group having 3 to 40 carbon atoms; a6 to 40-membered substituted or unsubstituted aryl group; a 5 to40-membered substituted or unsubstituted heterocyclic group; a 5 to40-membered substituted or unsubstituted aryloxy group; or a 5 to40-membered substituted or unsubstituted heteroaryloxy group, or combinewith each other to form a substituted or unsubstituted hydrocarbon ring,or the substituents in the same carbon combine with each other to form asubstituted or unsubstituted spiro bond.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently a substituted or unsubstituted alkyl group; a substitutedor unsubstituted aryl group; or a substituted or unsubstitutedheterocyclic group, or combine with each other to form a substituted orunsubstituted hydrocarbon ring, or the substituents in the same carboncombine with each other to form a substituted or unsubstituted spirobond.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently a substituted or unsubstituted alkyl group; or asubstituted or unsubstituted aryl group.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently a substituted or unsubstituted alkyl group; a substitutedor unsubstituted aryl group having 6 to 20 carbon atoms; or asubstituted or unsubstituted heterocyclic group.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently an alkyl group; an aryl group having 6 to 20 carbon atoms;or a heterocyclic group. According to an exemplary embodiment of thepresent specification, R3 and R4 are the same as or different from eachother, and each independently an alkyl group; a substituted orunsubstituted phenyl group; a substituted or unsubstituted biphenylgroup; or a substituted or unsubstituted naphthyl group, or R3 and R4combine with each other to form a 5-membered aliphatic ring.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently a methyl group; a substituted or unsubstituted phenylgroup; a substituted or unsubstituted biphenyl group; or a substitutedor unsubstituted naphthyl group, or R3 and R4 combine with each other toform a 5-membered aliphatic ring.

According to an exemplary embodiment of the present specification, R3and R4 are the same as or different from each other, and eachindependently a methyl group; an unsubstituted phenyl group; a phenylgroup substituted with a methyl group; a biphenyl group; or a naphthylgroup, or R3 and R4 combine with each other to form a 5-memberedaliphatic ring.

In another exemplary embodiment, R3 and R4 are the same as or differentfrom each other, and each independently a methyl group; a phenyl group;or a phenyl group substituted with a methyl group.

In an exemplary embodiment of the present specification, R1 to R4 arethe same as or different from each other, and each independentlyhydrogen; a substituted or unsubstituted alkyl group; or a substitutedor unsubstituted aryl group, or two or more adjacent substituentscombine with each other to form a substituted or unsubstitutedhydrocarbon ring, or the substituents in the same carbon combine witheach other to form a spiro bond.

In an exemplary embodiment of the present specification, R1 to R4 arethe same as or different from each other, and each independentlyhydrogen; a substituted or unsubstituted alkyl group; or a substitutedor unsubstituted aryl group, or two or more adjacent substituentscombine with each other to form a substituted or unsubstitutedhydrocarbon ring, or the substituents in the same carbon combine witheach other to form a substituted or unsubstituted spiro bond.

In an exemplary embodiment of the present specification, L1 is a directbond; or a substituted or unsubstituted arylene group.

In another exemplary embodiment, L1 is a direct bond; or an arylenegroup having 6 to 20 carbon atoms.

According to an exemplary embodiment of the present specification, L1may be a direct bond; or any one selected from the following structures.

The structures may be unsubstituted or substituted with one or moresubstituents selected from the group consisting of deuterium; a halogengroup; a nitrile group; a nitro group; a hydroxy group; a carbonylgroup; an ester group; an imide group; an amino group; a phosphine oxidegroup, an alkoxy group; an aryloxy group; an alkylthioxy group; anarylthioxy group; an alkylsulfoxy group; an arylsulfoxy group; a silylgroup; a boron group; an alkyl group; a cycloalkyl group; an alkenylgroup; an aryl group; an amine group; an arylphosphine group; or aheterocyclic group.

In an exemplary embodiment of the present specification, L1 is a directbond; a substituted or unsubstituted phenylene group; a substituted orunsubstituted biphenylylene group; a substituted or unsubstitutednaphthalene group; or a substituted or unsubstituted phenanthrenylenegroup.

In an exemplary embodiment of the present specification, (L1)₁ is adirect bond; a substituted or unsubstituted phenylene group; asubstituted or unsubstituted biphenylylene group; a substituted orunsubstituted naphthalene group; or a substituted or unsubstitutedphenanthrenylene group.

In an exemplary embodiment of the present specification, L1 is a directbond.

In another exemplary embodiment, L1 is a substituted or unsubstitutedphenylene group.

In still another exemplary embodiment, L1 is a phenylene group.

In an exemplary embodiment of the present specification, L1 is asubstituted or unsubstituted biphenylylene group.

In one exemplary embodiment, L1 is a biphenylylene group.

In an exemplary embodiment of the present specification, L1 is asubstituted or unsubstituted naphthalene group.

In an exemplary embodiment of the present specification, L1 is anaphthalene group.

In an exemplary embodiment of the present specification, L1 is asubstituted or unsubstituted phenanthrenylene group.

In another exemplary embodiment, L1 is a phenanthrenylene group.

In an exemplary embodiment of the present specification, L1 is a directbond; a phenylene group; or a naphthalene group.

In one exemplary embodiment of the present specification, L1 isunsubstituted or substituted with one or more deuteriums.

In an exemplary embodiment of the present specification, Formula 2 maybe selected from any one of the following structures.

In the structures, R3, R4, L1, and l are the same as those describedabove, and

the structures may be unsubstituted or substituted with one or moresubstituents selected from the group consisting of deuterium; a halogengroup; a nitrile group; a nitro group; an imide group; an amide group; ahydroxy group; a substituted or unsubstituted alkyl group; a substitutedor unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted alkenyl group; a substituted orunsubstituted amine group; a substituted or unsubstituted aryl group;and a substituted or unsubstituted heterocyclic group.

In an exemplary embodiment of the present specification, Ar3 may beselected from the following structures.

In an exemplary embodiment of the present specification, theheterocyclic compound represented by Formula 1 is represented by any oneof the following Formulae 1-1 to 1-627 and 2-1 to 2-363.

For- mula - - - Ar1 - - - Ar2 - - - Ar3 1-1

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

1-11

1-12

1-13

1-14

1-15

1-16

1-17

1-18

1-19

1-20

1-21

1-22

1-23

1-24

1-25

1-26

1-27

1-28

1-29

1-30

1-31

1-32

1-33

1-34

1-35

1-36

1-37

1-38

1-39

1-40

1-41

1-42

1-43

1-44

1-45

1-46

1-47

1-48

1-49

1-50

1-51

1-52

1-53

1-54

1-55

1-56

1-57

1-58

1-59

1-60

1-61

1-62

1-63

1-64

1-65

1-66

1-67

1-68

1-69

1-70

1-71

1-72

1-73

1-74

1-75

1-76

1-77

1-78

1-79

1-80

1-81

1-82

1-83

1-84

1-85

1-86

1-87

1-88

1-89

1-90

1-91

1-92

1-93

1-94

1-95

1-96

1-97

1-98

1-99

1-100

1-101

1-102

1-103

1-104

1-105

1-106

1-107

1-108

1-109

1-110

1-111

1-112

1-113

1-114

1-115

1-116

1-117

1-118

1-119

1-120

1-121

1-122

1-123

1-124

1-125

1-126

1-127

1-128

1-129

1-130

1-131

1-132

1-133

1-134

1-135

1-136

1-137

1-138

1-139

1-140

1-141

1-142

1-143

1-144

1-145

1-146

1-147

1-148

1-149

1-150

1-151

1-152

1-153

1-154

1-155

1-156

1-157

1-158

1-159

1-160

1-161

1-162

1-163

1-164

1-165

1-166

1-167

1-168

1-169

1-170

1-171

1-172

1-173

1-174

1-175

1-176

1-177

1-178

1-179

1-180

1-181

1-182

1-183

1-184

1-185

1-186

1-187

1-188

1-189

1-190

1-191

1-192

1-193

1-194

1-195

1-196

1-197

1-198

1-199

1-200

1-201

1-202

1-203

1-204

1-205

1-206

1-207

1-208

1-209

1-210

1-211

1-212

1-213

1-214

1-215

1-216

1-217

1-218

1-219

1-220

1-221

1-222

1-223

1-224

1-225

1-226

1-227

1-228

1-229

1-230

1-231

1-232

1-233

1-234

1-235

1-236

1-237

1-238

1-239

1-240

1-241

1-242

1-243

1-244

1-245

1-246

1-247

1-248

1-249

1-250

1-251

1-252

1-253

1-254

1-255

1-256

1-257

1-258

1-259

1-260

1-261

1-262

1-263

1-264

1-265

1-266

1-267

1-268

1-269

1-270

1-271

1-272

1-273

1-274

1-275

1-276

1-277

1-278

1-279

1-280

1-281

1-282

1-283

1-284

1-285

1-286

1-287

1-288

1-289

1-290

1-291

1-292

1-293

1-294

1-295

1-296

1-297

1-298

1-299

1-300

1-301

1-302

1-303

1-304

1-305

1-306

1-307

1-308

1-309

1-310

1-311

1-312

1-313

1-314

1-315

1-316

1-317

1-318

1-319

1-320

1-321

1-322

1-323

1-324

1-325

1-326

1-327

1-328

1-329

1-330

1-331

1-332

1-333

1-334

1-335

1-336

1-337

1-338

1-339

1-340

1-341

1-342

1-343

1-344

1-345

1-346

1-347

1-348

1-349

1-350

1-351

1-352

1-353

1-354

1-355

1-356

1-357

1-358

1-359

1-360

1-361

1-362

1-363

1-364

1-365

1-366

1-367

1-368

1-369

1-370

1-371

1-372

1-373

1-374

1-375

1-376

1-377

1-378

1-379

1-380

1-381

1-382

1-383

1-384

1-385

1-386

1-387

1-388

1-389

1-390

1-391

1-392

1-393

1-394

1-395

1-396

1-397

1-398

1-399

1-400

1-401

1-402

1-403

1-404

1-405

1-406

1-407

1-408

1-409

1-410

1-411

1-412

1-413

1-414

1-415

1-416

1-417

1-418

1-419

1-420

1-421

1-422

1-423

1-424

1-425

1-426

1-427

1-428

1-429

1-430

1-431

1-432

1-433

1-434

1-435

1-436

1-437

1-438

1-439

1-440

1-441

1-442

1-443

1-444

1-445

1-446

1-447

1-448

1-449

1-450

1-451

1-452

1-453

1-454

1-455

1-456

1-457

1-458

1-459

1-460

1-461

1-462

1-463

1-464

1-465

1-466

1-467

1-468

1-469

1-470

1-471

1-472

1-473

1-474

1-475

1-476

1-477

1-478

1-479

1-480

1-481

1-482

1-483

1-484

1-485

1-486

1-487

1-488

1-489

1-490

1-491

1-492

1-493

1-494

1-495

1-496

1-497

1-498

1-499

1-500

1-501

1-502

1-503

1-504

1-505

1-506

1-507

1-508

1-509

1-510

1-511

1-512

1-513

1-514

1-515

1-516

1-517

1-518

1-519

1-520

1-521

1-522

1-523

1-524

1-525

1-526

1-527

1-528

1-529

1-530

1-531

1-532

1-533

1-534

1-535

1-536

1-537

1-538

1-539

1-540

1-541

1-542

1-543

1-544

1-545

1-546

1-547

1-548

1-549

1-550

1-551

1-552

1-553

1-554

1-555

1-556

1-557

1-558

1-559

1-560

1-561

1-562

1-563

1-564

1-565

1-566

1-567

1-568

1-569

1-570

1-571

1-572

1-573

1-574

1-575

1-576

1-577

1-578

1-579

1-580

1-581

1-582

1-583

1-584

1-585

1-586

1-587

1-588

1-589

1-590

1-591

1-592

1-593

1-594

1-595

1-596

1-597

1-598

1-599

1-600

1-601

1-602

1-603

1-604

1-605

1-606

1-607

1-608

1-609

1-610

1-611

1-612

1-613

1-614

1-615

1-616

1-617

1-618

1-619

1-620

1-621

1-622

1-623

1-624

1-625

1-626

1-627

Formula - - - An1 - - - Ar2 - - - Ar3 2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

2-11

2-12

2-13

2-14

2-15

2-16

2-17

2-18

2-19

2-20

2-21

2-22

2-23

2-24

2-25

2-26

2-27

2-28

2-29

2-30

2-31

2-32

2-33

2-34

2-35

2-36

2-37

2-38

2-39

2-40

2-41

2-42

2-43

2-44

2-45

2-46

2-47

2-48

2-49

2-50

2-51

2-52

2-53

2-54

2-55

2-56

2-57

2-58

2-59

2-60

2-61

2-62

2-63

2-64

2-65

2-66

2-67

2-68

2-69

2-70

2-71

2-72

2-73

2-74

2-75

2-76

2-77

2-78

2-79

2-80

2-81

2-82

2-83

2-84

2-85

2-86

2-87

2-88

2-89

2-90

2-91

2-92

2-93

2-94

2-95

2-96

2-97

2-98

2-99

2-100

2-101

2-102

2-103

2-104

2-105

2-106

2-107

2-108

2-109

2-110

2-111

2-112

2-113

2-114

2-115

2-116

2-117

2-118

2-119

2-120

2-121

2-122

2-123

2-124

2-125

2-126

2-127

2-128

2-129

2-130

2-131

2-132

2-133

2-134

2-135

2-136

2-137

2-138

2-139

2-140

2-141

2-142

2-143

2-144

2-145

2-146

2-147

2-148

2-149

2-150

2-151

2-152

2-153

2-154

2-155

2-156

2-157

2-158

2-159

2-160

2-161

2-162

2-163

2-164

2-165

2-166

2-167

2-168

2-169

2-170

2-171

2-172

2-173

2-174

2-175

2-176

2-177

2-178

2-179

2-180

2-181

2-182

2-183

2-184

2-185

2-186

2-187

2-188

2-189

2-190

2-191

2-192

2-193

2-194

2-195

2-196

2-197

2-198

2-199

2-200

2-201

2-202

2-203

2-204

2-205

2-206

2-207

2-208

2-209

2-210

2-211

2-212

2-213

2-214

2-215

2-216

2-217

2-218

2-219

2-220

2-221

2-222

2-223

2-224

2-225

2-226

2-227

2-228

2-229

2-230

2-231

2-232

2-233

2-234

2-235

2-236

2-237

2-238

2-239

2-240

2-241

2-242

2-243

2-244

2-245

2-246

2-247

2-248

2-249

2-250

2-251

2-252

2-253

2-254

2-255

2-256

2-257

2-258

2-259

2-260

2-261

2-262

2-263

2-264

2-265

2-266

2-267

2-268

2-269

2-270

2-271

2-272

2-273

2-274

2-275

2-276

2-277

2-278

2-279

2-280

2-281

2-282

2-283

2-284

2-285

2-286

2-287

2-288

2-289

2-290

2-291

2-292

2-293

2-294

2-295

2-296

2-297

2-298

2-299

2-300

2-301

2-302

2-303

2-304

2-305

2-306

2-307

2-308

2-309

2-310

2-311

2-312

2-313

2-314

2-315

2-316

2-317

2-318

2-319

2-320

2-321

2-322

2-323

2-324

2-325

2-326

2-327

2-328

2-329

2-330

2-331

2-332

2-333

2-334

2-335

2-336

2-337

2-338

2-339

2-340

2-341

2-342

2-343

2-344

2-345

2-346

2-347

2-348

2-349

2-350

2-351

2-352

2-353

2-354

2-355

2-356

2-357

2-358

2-359

2-360

2-361

2-362

2-363

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes one or two or more of the compoundsrepresented by Formulae 3 to 6.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound represented by Formula3.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound represented by Formula4.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound represented by Formula5.

Specifically, when the second electron transporting layer includes animidazole derivative, a pyridine derivative, and a condensed ringderivative of imidazole, an unshared electron pair of a nitrogen atom oran oxygen atom of a phosphine oxide group is effectively bonded tometal, and thus, doping with an n-type dopant may effectively occur.Accordingly, the transport and/or injection of electrons from thecathode is facilitated, and an organic light emitting diode having lowdriving voltage may be provided.

Further, when the organic light emitting diode is driven, an unsharedelectron pair of a nitrogen atom or an oxygen atom of a phosphine oxidegroup may be bonded to metal to prevent metal from moving by a fieldapplied to the organic material layer, thereby suppressing the drivingvoltage of the organic light emitting diode from being increased, and itis possible to implement an organic light emitting diode having a longservice life.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound represented by Formula3.

In an exemplary embodiment of the present specification, A is any one ofthe following structures which are substituted or unsubstituted.

In an exemplary embodiment of the present specification, A isunsubstituted or substituted with a substituent selected from the groupconsisting of a halogen group; a substituted or unsubstituted alkylgroup; and a substituted or unsubstituted aryl group.

In an exemplary embodiment of the present specification, A isunsubstituted or substituted with a substituent selected from the groupconsisting of fluorine; a methyl group; a phenyl group substituted withan alkyl group; and a phenyl group.

In an exemplary embodiment of the present specification, A is a2,7-naphthalene group; a 2,7-fluorenylene group; 2,7-dibenzofuranylene;or a 1,6-naphthalene group.

In an exemplary embodiment of the present specification, L2 and L3 arethe same as or different from each other, and each independently adirect bond; a substituted or unsubstituted arylene group; or asubstituted or unsubstituted divalent hetero ring.

In an exemplary embodiment of the present specification, L2 and L3 are adirect bond; an arylene group; or a divalent heterocyclic group, and thearylene group and the divalent hetero ring are unsubstituted orsubstituted with an aryl group.

In an exemplary embodiment of the present specification, L2 and L3 arethe same as or different from each other, and each independently adirect bond; a substituted or unsubstituted phenylene group; asubstituted or unsubstituted naphthalene group; a substituted orunsubstituted biphenylylene group; a substituted or unsubstitutedpyridylene group; or a substituted or unsubstituted thiophenylene group.

In an exemplary embodiment of the present specification, L2 and L3 arethe same as or different from each other, and each independently adirect bond; a phenylene group; a phenylene group substituted with aphenyl group; a naphthalene group; a biphenylylene group; a pyridylenegroup; or a thiophenylene group.

In one exemplary embodiment of the present specification, L2 is aphenylene group.

In another exemplary embodiment, L3 is a phenylene group.

In an exemplary embodiment of the present specification, A1 and A2 arethe same as or different from each other, and each independently asubstituted or unsubstituted alkyl group; or a substituted orunsubstituted aryl group.

In another exemplary embodiment, A1 and A2 are the same as or differentfrom each other, and each independently a methyl group; an ethyl group;an isopropyl group; a t-butyl group; a phenyl group; a naphthyl group; afluorenyl group substituted with an alkyl group; or a pyridine group.

In an exemplary embodiment of the present specification, A1 and A2 arethe same as or different from each other, and each a substituted orunsubstituted alkyl group.

In another exemplary embodiment, A1 and A2 are a substituted orunsubstituted alkyl group having 1 to 10 carbon atoms.

In one exemplary embodiment, A1 and A2 are a methyl group.

In an exemplary embodiment of the present specification, A1 and A2 arethe same as or different from each other, and each independently asubstituted or unsubstituted aryl group.

In another exemplary embodiment, A1 and A2 are each independently asubstituted or unsubstituted aryl group having 6 to 20 carbon atoms.

In an exemplary embodiment of the present specification, A1 and A2 are anaphthyl group.

In an exemplary embodiment of the present specification, T1 to T8 arethe same as or different from each other, and each independentlyhydrogen; a substituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group.

In an exemplary embodiment of the present specification, T1 to T8 arethe same as or different from each other, and each independentlyhydrogen; a substituted or unsubstituted phenyl group; a substituted orunsubstituted naphthyl group; or a substituted or unsubstituted pyridinegroup.

In an exemplary embodiment of the present specification, T1 to T8 arethe same as or different from each other, and each independentlyhydrogen; a phenyl group; a naphthyl group; or a pyridine group.

In an exemplary embodiment of the present specification, T1 is hydrogen.

In another exemplary embodiment, T2 is hydrogen.

In an exemplary embodiment of the present specification, T3 is asubstituted or unsubstituted aryl group.

In another exemplary embodiment, T3 is a substituted or unsubstitutedphenyl group.

In still another exemplary embodiment, T3 is a phenyl group.

In yet another exemplary embodiment, T3 is a substituted orunsubstituted naphthyl group.

In still yet another exemplary embodiment, T3 is a naphthyl group.

In an exemplary embodiment of the present specification, T3 is asubstituted or unsubstituted heterocyclic group.

In another exemplary embodiment, T3 is a heterocyclic group includingnitrogen.

In still another exemplary embodiment, T3 is a monocyclic heterocyclicgroup including nitrogen.

In an exemplary embodiment of the present specification, T3 is apyridine group.

In an exemplary embodiment of the present specification, T4 is hydrogen.

In another exemplary embodiment, T5 is hydrogen. In an exemplaryembodiment of the present specification, T6 is a substituted orunsubstituted aryl group.

In another exemplary embodiment, T6 is a substituted or unsubstitutedphenyl group.

In still another exemplary embodiment, T6 is a phenyl group.

In yet another exemplary embodiment, T6 is a substituted orunsubstituted naphthyl group.

In still yet another exemplary embodiment, T6 is a naphthyl group.

In an exemplary embodiment of the present specification, T6 is asubstituted or unsubstituted heterocyclic group.

In another exemplary embodiment, T6 is a heterocyclic group includingnitrogen.

In still another exemplary embodiment, T6 is a monocyclic heterocyclicgroup including nitrogen.

In an exemplary embodiment of the present specification, T6 is apyridine group.

In an exemplary embodiment of the present specification, T7 is hydrogen.

In another exemplary embodiment, T8 is hydrogen.

In an exemplary embodiment of the present specification, T1 and T2combine with each other to form a hydrocarbon ring.

In another exemplary embodiment, T1 and T2 combine with each other toform a benzene ring.

In an exemplary embodiment of the present specification, T3 and T4combine with each other to form a hydrocarbon ring.

In another exemplary embodiment, T3 and T4 combine with each other toform a benzene ring.

In an exemplary embodiment of the present specification, T5 and T6combine with each other to form a hydrocarbon ring.

In one exemplary embodiment, T5 and T6 combine with each other to form abenzene ring.

In an exemplary embodiment of the present specification, T7 and T8combine with each other to form a hydrocarbon ring.

In another exemplary embodiment, T7 and T8 combine with each other toform a benzene ring.

In still another exemplary embodiment, the compound represented byFormula 3 is represented by any one of the following Formulae 3-1 to3-101.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound of Formula 4.

In an exemplary embodiment of the present specification, T9 is hydrogen.

In another exemplary embodiment, T9 is

In an exemplary embodiment of the present specification, T10 ishydrogen.

In another exemplary embodiment, T10 is

In an exemplary embodiment of the present specification, at least one ofT9 and T10 is

In another exemplary embodiment, one of T9 and T10 is

In still another exemplary embodiment, two of T9 and T10 are

In an exemplary embodiment of the present specification, T9 and T10combine with an adjacent group to form a substituted or unsubstitutedhydrocarbon ring.

In another exemplary embodiment, T9 and T10 combine with an adjacentgroup to form a substituted or unsubstituted benzene ring.

In still another exemplary embodiment, T9 and T10 combine with anadjacent group to form a benzene ring.

In an exemplary embodiment of the present specification, T10 combinewith an adjacent group to form a benzene ring.

In an exemplary embodiment of the present specification, Ar4 and Ar5 arethe same as or different from each other, and each independently asubstituted or unsubstituted aryl group.

In an exemplary embodiment of the present specification, Ar4 and Ar5 arethe same as or different from each other, and each independently asubstituted or unsubstituted phenyl group; or a substituted orunsubstituted naphthyl group.

In an exemplary embodiment of the present specification, Ar4 and Ar5 area phenyl group.

In another exemplary embodiment, Ar4 and Ar5 are a naphthyl group.

In an exemplary embodiment of the present specification, one of Ar4 andAr5 is a phenyl group, and the other one is a naphthyl group.

In another exemplary embodiment, X1 is O.

In an exemplary embodiment of the present specification, L4 is a directbond; or a substituted or unsubstituted arylene group.

In an exemplary embodiment of the present specification, L4 is acombination of one or two or more from the group consisting of a directbond; a substituted or unsubstituted phenylene group; a substituted orunsubstituted biphenylylene group; a substituted or unsubstitutednaphthalene group; a substituted or unsubstituted fluorenylene group;and a substituted or unsubstituted pyrenylene group.

In an exemplary embodiment of the present specification, L4 is aphenylene group; a biphenylylene group; a naphthylene group; afluorenylene group; a pyrenylene group; a phenylene-naphthylene group; aphenylene-pyrenylene group; or a phenylene-fluorenylene group, and L4 isunsubstituted or substituted with a substituent selected from the groupconsisting of an alkyl group and an aryl group, or forms a spirostructure.

In an exemplary embodiment of the present specification, L4 is a directbond; a phenylene group; or a biphenylylene group.

In the present specification, the “spiro bond” may mean a structure inwhich substituents in the same carbon combine with each other, and tworing compounds are linked to each other through one atom.

In the present specification, the spiro structure may form a fluorenestructure.

In an exemplary embodiment of the present specification, L4 is a directbond; a phenylene group; a biphenylylene group; a naphthalene group; afluorenylene group substituted with a methyl group; a fluorenylene groupsubstituted with a phenyl group; a spirobifluorenylene group; apyrenylene group; a phenylene-naphthylene group; a phenylene-pyrenylenegroup; fluorenylene substituted with a phenylene-methyl group;fluorenylene substituted with a phenylene-phenyl group; or aspirofluorenylene group.

In an exemplary embodiment of the present specification, the compoundrepresented by Formula 4 is represented by any one of the followingFormulae 4-1 to 4-84.

In an exemplary embodiment of the present specification, the secondelectron transporting layer includes the compound represented by Formula5.

In an exemplary embodiment of the present specification, Formula 5 isselected from any one of the following Formulae 5A to 5C.

In Formulae 5A to 5C,

A′, Cz, L6, and L7 are the same as those defined in Formula 5.

In an exemplary embodiment of the present specification, A′ is selectedfrom the following structures.

The structure is unsubstituted or substituted with one or two or moresubstituents selected from the group consisting of deuterium; a halogengroup; a nitrile group; a nitro group; a hydroxy group; a substituted orunsubstituted alkyl group; a substituted or unsubstituted cycloalkylgroup; a substituted or unsubstituted alkoxy group; a substituted orunsubstituted aryloxy group; a substituted or unsubstituted alkylthioxygroup; a substituted or unsubstituted arylthioxy group; a substituted orunsubstituted alkylsulfoxy group; a substituted or unsubstitutedarylsulfoxy group; a substituted or unsubstituted alkenyl group; asubstituted or unsubstituted silyl group; a substituted or unsubstitutedboron group; a substituted or unsubstituted aryl group; and asubstituted or unsubstituted heterocyclic group.

In one exemplary embodiment of the present specification, the pyrenylenestructure is unsubstituted or substituted with a substituted orunsubstituted alkyl group. In another exemplary embodiment, thepyrenylene structure is unsubstituted or substituted with a substitutedor unsubstituted alkyl group having 1 to 10 carbon atoms.

In an exemplary embodiment of the present specification, the pyrenylstructure is unsubstituted or substituted with a t-butyl group.

In an exemplary embodiment of the present specification, A′ is

In another exemplary embodiment, A′ is

In an exemplary embodiment of the present specification, L6 and L7 arethe same as or different from each other, and each independently adirect bond; or a substituted or unsubstituted arylene group.

In another exemplary embodiment, L6 and L7 are the same as or differentfrom each other, and each independently a direct bond; or a substitutedor unsubstituted arylene group having 6 to 30 carbon atoms.

In still another exemplary embodiment, L6 and L7 are the same as ordifferent from each other, and each independently a direct bond; or asubstituted or unsubstituted phenylene group.

In an exemplary embodiment of the present specification, L6 is aphenylene group.

In another exemplary embodiment, L6 is a direct bond.

In still another exemplary embodiment, L7 is a phenylene group.

The phenylene group of the present specification may be selected fromthe following structures.

The phenylene group may be unsubstituted or substituted with one or twoor more substituents selected from the group consisting of deuterium; ahalogen group; a nitrile group; a nitro group; a hydroxy group; asubstituted or unsubstituted alkyl group; a substituted or unsubstitutedcycloalkyl group; a substituted or unsubstituted alkoxy group; asubstituted or unsubstituted aryloxy group; a substituted orunsubstituted alkylthioxy group; a substituted or unsubstitutedarylthioxy group; a substituted or unsubstituted alkylsulfoxy group; asubstituted or unsubstituted arylsulfoxy group; a substituted orunsubstituted alkenyl group; a substituted or unsubstituted silyl group;a substituted or unsubstituted boron group; a substituted orunsubstituted aryl group; and a substituted or unsubstitutedheterocyclic group.

In an exemplary embodiment of the present specification, Cz may beselected from the following structures.

The structure is unsubstituted or substituted with one or two or moresubstituents selected from the group consisting of deuterium; a halogengroup; a nitrile group; a nitro group; a hydroxy group; a substituted orunsubstituted alkyl group; a substituted or unsubstituted cycloalkylgroup; a substituted or unsubstituted alkoxy group; a substituted orunsubstituted aryloxy group; a substituted or unsubstituted alkylthioxygroup; a substituted or unsubstituted arylthioxy group; a substituted orunsubstituted alkylsulfoxy group; a substituted or unsubstitutedarylsulfoxy group; a substituted or unsubstituted alkenyl group; asubstituted or unsubstituted silyl group; a substituted or unsubstitutedboron group; a substituted or unsubstituted aryl group; and asubstituted or unsubstituted heterocyclic group.

In an exemplary embodiment of the present specification, Cz isunsubstituted or substituted with a substituted or unsubstituted arylgroup.

In another exemplary embodiment, Cz is unsubstituted or substituted witha substituted or unsubstituted aryl group having 6 to 30 carbon atoms.

In still another exemplary embodiment, Cz is unsubstituted orsubstituted with a substituted or unsubstituted phenyl group.

In an exemplary embodiment of the present specification, Cz is

In an exemplary embodiment of the present specification, the compoundrepresented by Formula 5 is represented by any one of the followingFormulae 5-1 to 5-37.

In an exemplary embodiment of the present specification, the organiclight emitting diode has a tandem structure. In this case, it ispossible to manufacture a white light emitting diode with a stack of ablue fluorescence, a green phosphorescence, and red phosphorescence; anda stack of a blue fluorescence and a greenish yellow phosphorescence.Specifically, the organic light emitting diode according to an exemplaryembodiment of the present specification may include a fluorescence lightemitting diode and/or a phosphorescence light emitting diode.

In an exemplary embodiment of the present specification, the organiclight emitting diode includes two or more light emitting layers, andincludes a charge generating layer between the two adjacent lightemitting layers in the two or more light emitting layers, the chargegenerating layer includes the second electron transporting layer and ap-type organic material layer, and the first electron transporting layeris provided between the light emitting layer and the second electrontransporting layer.

In another exemplary embodiment, the second electron transporting layerand the p-type organic material layer, which are included in the chargegenerating layer, form an NP junction.

In an exemplary embodiment of the present specification, the p-typeorganic material layer is selected from the group consisting of a holeinjection layer, a hole transporting layer, an electron blocking layer,and a light emitting layer.

In the present specification, the n-type means n-type semiconductorcharacteristics. In other words, the n-type is a characteristic in thatelectrons are injected or transported through the lowest unoccupiedmolecular orbital (LUMO) energy level, and this may be defined as acharacteristic of a material having a larger electron mobility than thehole mobility. In contrast, the p-type means p-type semiconductorcharacteristics. In other words, the p-type is a characteristic in thatholes are injected or transported through the highest occupied molecularorbital (HOMO) energy level, and this may be defined as a characteristicof a material having a larger hole mobility than the electron mobility.In the present specification, a compound or an organic material layerhaving n-type characteristics may be mentioned as an n-type compound oran n-type organic material layer. Further, a compound or an organicmaterial layer having p-type characteristics may be mentioned as ap-type compound or a p-type organic material layer. In addition, then-type doping may mean that a doping is conducted so as to have n-typecharacteristics.

In the present specification, a charge generating layer is a layer ofgenerating charges without the application of an external voltage, andgenerates charges between adjacent light emitting layers among two ormore light emitting layers to allow the two or more light emittinglayers included in the organic light emitting diode to be capable ofemitting light.

The charge generating layer according to an exemplary embodiment of thepresent specification includes an n-type organic light emitting layerand a p-type organic material layer, and the n-type organic materiallayer is the above-described second electron transporting layer.

When the n-type organic material layer is not used in the chargegenerating layer, holes and electrons are not effectively produced, sothat there may occur a problem in that a part of two or more lightemitting layers do not emit light. When a second electron transportinglayer is used as an n-type organic material layer according to anexemplary embodiment of the present specification, electrons and holesare effectively produced from the charge generating layer, and thus, anefficient light emission may be expected from two or more light emittinglayers.

The NP junction in the present specification may mean not only physicalcontact of the second electron transporting layer, which is an n-typeorganic material layer, with the p-type organic material layer, but alsointeraction which may easily generate and transport holes and electrons.

According to an exemplary embodiment of the present specification, whenan NP junction is formed, holes or electrons may be easily formed by anexternal voltage or a light source. Accordingly, it is possible toprevent a driving voltage for injecting holes from being increased.

In an exemplary embodiment of the present specification, the p-typeorganic material layer includes one or two or more compounds selectedfrom the group consisting of the following Formulae 7 to 9.

In Formula 7,

A10 to A15 are the same as or different from each other, and eachindependently hydrogen; a nitrile group; a nitro group; an amide group;a carbonyl group; a substituted or unsubstituted sulfonyl group; asubstituted or unsubstituted ester group; a substituted or unsubstitutedalkyl group; a substituted or unsubstituted alkenyl group; a substitutedor unsubstituted aryl group; or a substituted or unsubstitutedheterocyclic group, or combine with an adjacent group to form asubstituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring,

in Formula 8,

A16 to A18 are the same as or different from each other, and eachindependently an aryl group, which is unsubstituted or substituted withone or two or more substituents selected from the group consisting of acyano group, a halogen group, and a haloalkyl group; or a heterocyclicgroup, which is unsubstituted or substituted with one or two or moresubstituents selected from the group consisting of a cyano group, ahalogen group, and a haloalkyl group, and

in Formula 9,

Ar10 is a substituted or unsubstituted hydrocarbon ring; or asubstituted or unsubstituted hetero ring,

Y1 to Y4 are the same as or different from each other, and eachindependently N; or CA23,

A19 to A23 are the same as or different from each other, and eachindependently hydrogen; a nitrile group; a halogen group; a substitutedor unsubstituted alkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted aryloxy group; a substituted orunsubstituted aryl group; or a substituted or unsubstituted heterocyclicgroup, or combine with an adjacent group to form a substituted orunsubstituted hydrocarbon ring or a substituted or unsubstituted heteroring,

Cy1 and Cy2 are the same as or different from each other, and eachindependently any one of the following structures, and

A24 to A26 are the same as or different from each other, and eachindependently a nitrile group; a substituted or unsubstituted estergroup; or a substituted or unsubstituted trifluoroalkyl group.

In an exemplary embodiment of the present specification, the p-typeorganic material layer includes only a compound of Formula 7.

In another exemplary embodiment, Formula 8 is used as a p-type dopant.Accordingly, a p-type organic material layer including Formula 8 may beused together with a general hole transporting material.

In still another exemplary embodiment, Formula 9 is used as a p-typedopant. Accordingly, a p-type organic material layer including Formula 9may be used together with a general hole transporting material.

According to an exemplary embodiment of the present specification, whenthe second electron transporting layer is included as an n-type organicmaterial layer of the charge generating layer and an organic materiallayer including one or two or more compounds selected from the groupconsisting of Formulae 7 to 9 is included as a p-type organic materiallayer of the charge generating layer, electrons and holes areeffectively produced from the charge generating layer, so that the lightemitting efficiency of two or more light emitting layers, which are usedin a tandem structure, may be excellent.

In an exemplary embodiment of the present specification, A10 to A15 arethe same as or different from each other, and each independently anitrile group; a nitro group; a substituted or unsubstituted sulfonylgroup (SO₂R); a substituted or unsubstituted alkenyl group; or asubstituted or unsubstituted aryl group.

R means a substituted or unsubstituted aryl group.

In another exemplary embodiment, A10 to A15 are each an alkenyl groupsubstituted with a nitrile group.

In another exemplary embodiment of the present specification, A10 to A15are each a nitro group; or an aryl group substituted with a nitrilegroup.

In another exemplary embodiment, A10 to A15 are each a nitro group; or aphenyl group substituted with a nitrile group.

In an exemplary embodiment of the present specification, the compoundrepresented by Formula 7 may be represented by any one of the followingFormulae 7-1 to 7-6.

In an exemplary embodiment of the present specification, the p-typeorganic material layer includes Formula 7-1.

In an exemplary embodiment of the present specification, A16 to A18 arethe same as or different from each other, and each independently aphenyl group; a naphthyl group; a pyridine group; a pyrazine group; apyrimidine group; a quinoline group; or an isoquinoline group, and

the phenyl group; the naphthyl group; the pyridine group; the pyrazinegroup; the pyrimidine group; the quinoline group; and the isoquinolinegroup may be unsubstituted or substituted with one or two or moresubstituents selected from the group consisting of a cyano group, ahalogen group, and a haloalkyl group.

In an exemplary embodiment of the present specification, A1 to A3 arethe same as or different from each other, and each independently aphenyl group substituted with fluorine and a cyano group.

In an exemplary embodiment of the present specification, the compoundrepresented by Formula 8 is represented by the following Formula 8-1.

In another exemplary embodiment of the present specification, the p-typeorganic material layer includes a generally used hole transportingmaterial and Formula 8-1.

In another exemplary embodiment, the p-type organic material layerincludes NPB and Formula 8-1.

In an exemplary embodiment of the present specification, Ar10 is asubstituted or unsubstituted benzene ring; or a substituted orunsubstituted naphthalene ring.

In another exemplary embodiment, Ar10 is a benzene ring.

In an exemplary embodiment of the present specification, Ar10 is anaphthalene ring.

In an exemplary embodiment of the present specification, Y1 to Y4 arethe same as or different from each other, and each independently CA23.

In an exemplary embodiment of the present specification, A19 to A22 arethe same as or different from each other, and each independentlyhydrogen; a halogen group; a substituted or unsubstituted alkyl group; asubstituted or unsubstituted alkoxy group; or a substituted orunsubstituted aryl group.

In an exemplary embodiment of the present specification, A19 to A22 arethe same as or different from each other, and each independentlyhydrogen; fluorine; a trifluoroalkyl group; or a trifluoroalkoxy group;or an aryl group substituted once or twice or more with a substituentselected from the group consisting of a halogen group and atrifluoroalkyl group.

In an exemplary embodiment of the present specification, A20 ishydrogen.

In another exemplary embodiment, A22 is hydrogen.

In an exemplary embodiment of the present specification, A19 is asubstituted or unsubstituted aryl group.

In another exemplary embodiment, A19 is an aryl group substituted onceor twice or more with a substituent selected from the group consistingof a halogen group and a trifluoroalkyl group.

In one exemplary embodiment, A19 is a phenyl group substituted once ortwice or more with a substituent selected from the group consisting offluorine and a trifluoromethyl group.

In an exemplary embodiment of the present specification, A19 is a phenylgroup substituted with a trifluoromethyl group.

In another exemplary embodiment, A19 is a phenyl group substituted withfluorine.

In an exemplary embodiment of the present specification, A19 is ahalogen group.

In another exemplary embodiment, A19 is fluorine.

In an exemplary embodiment of the present specification, A19 is analkoxy group substituted with a trifluoroalkyl group.

In another exemplary embodiment, A19 is a trifluoromethyloxy group.

In an exemplary embodiment of the present specification, A20 is asubstituted or unsubstituted aryl group.

In another exemplary embodiment, A20 is an aryl group substituted onceor twice or more with a substituent selected from the group consistingof a halogen group and a trifluoroalkyl group.

In one exemplary embodiment, A20 is a phenyl group substituted once ortwice or more with a substituent selected from the group consisting offluorine and a trifluoromethyl group.

In an exemplary embodiment of the present specification, A20 is a phenylgroup substituted with a trifluoromethyl group.

In another exemplary embodiment, A20 is a phenyl group substituted withfluorine.

In an exemplary embodiment of the present specification, A20 is ahalogen group.

In another exemplary embodiment, A20 is fluorine.

In an exemplary embodiment of the present specification, A20 is analkoxy group substituted with a trifluoroalkyl group.

In another exemplary embodiment, A20 is a trifluoromethyloxy group.

In an exemplary embodiment of the present specification, Cy1 is

In another exemplary embodiment, Cy2 is

In an exemplary embodiment of the present specification, A24 is anitrile group.

In an exemplary embodiment of the present specification, Cy1 is

In an exemplary embodiment of the present specification, Cy2 is

In another exemplary embodiment, A25 and A26 are the same as each other,and each independently a nitrile group. In an exemplary embodiment ofthe present specification, A23 is hydrogen.

In an exemplary embodiment of the present specification, the compoundrepresented by Formula 9 is represented by the following Formulae 9-1 to9-7.

The organic light emitting diode according to an exemplary embodiment ofthe present specification includes a first electron transporting layerincluding the above-described heterocyclic compound represented byFormula 1 between a cathode and a light emitting layer, and may bemanufactured by materials and methods known in the art, except that thefirst electron transporting layer and a second electron transportinglayer including the compound represented by Formulae 3 to 5 areprovided.

For example, the organic light emitting diode of the presentspecification may be manufactured by sequentially stacking an anode, anorganic material layer, and a cathode on a substrate. In this case, theorganic light emitting diode may be manufactured by depositing a metalor a metal oxide having conductivity, or an alloy thereof on a substrateto form an anode by using a physical vapor deposition (PVD) method suchas sputtering or e-beam evaporation, forming an organic material layerincluding a hole injection layer, a hole transporting layer, an electronblocking layer, a light emitting layer, an electron transporting layer,and an electron injection layer thereon, and then depositing a materialwhich may be used as a cathode thereon. In addition to the methoddescribed above, an organic light emitting diode may be made bysubsequently depositing a cathode material, an organic material layer,and an anode material on a substrate. In addition to the methoddescribed above, an organic light emitting diode may be made bysubsequently depositing an anode material, an organic material layer,and a cathode material on a substrate.

The organic material layer of the organic light emitting diode of thepresent specification may be composed of a multi-layered structure inwhich an organic material layer having one or more layers is stacked.

In an exemplary embodiment of the present specification, the organiclight emitting diode may further include one or more layers selectedfrom the group consisting of a hole injection layer, a hole transportinglayer, an electron transporting layer, an electron injection layer, anelectron blocking layer, and a hole blocking layer.

For example, the structure of the organic light emitting diode of thepresent specification may have the same structures as those illustratedin FIGS. 1 to 4, but is not limited thereto.

FIG. 1 illustrates the structure of an organic light emitting diode inwhich an anode 201, a hole transporting layer 301, a light emittinglayer 401, a first electron transporting layer 501, a second electrontransporting layer 601, and a cathode 701 are sequentially stacked on asubstrate 101.

In FIG. 1, the heterocyclic compound represented by Formula 1 isincluded in the first electron transporting layer 501, and one or moreof the compounds represented by Formulae 3 to 5 and a metal dopant areincluded in the second electron transporting layer 601.

FIG. 2 illustrates the structure of a tandem-type organic light emittingdiode in which an anode 201, a hole transporting layer 301, a firstlight emitting layer 401, a first electron transporting layer 501, asecond electron transporting layer 601, a p-type organic material layer801, a second light emitting layer 402, and a cathode 701 aresequentially stacked on a substrate 101.

In FIG. 2, the heterocyclic compound represented by Formula 1 isincluded in the first electron transporting layer 501, and one or moreof the compounds represented by Formulae 3 to 5 and a metal dopant areincluded in the second electron transporting layer 601. Further, thesecond electron transporting layer 601 and the p-type organic materiallayer 801 may constitute a charge generating layer 901.

FIG. 3 illustrates the structure of a tandem-type organic light emittingdiode in which an anode 201, a hole injection layer 1001, a first holetransporting layer 301, a first light emitting layer 401, a firstelectron transporting layer 501, a second electron transporting layer601, a p-type organic material layer 801, a second hole transportinglayer 302, a second light emitting layer 402, an electron transportinglayer 1101, and a cathode 701 are sequentially stacked on a substrate101.

In FIG. 3, the heterocyclic compound represented by Formula 1 isincluded in the first electron transporting layer 501, and one or moreof the compounds represented by Formulae 3 to 5 and a metal dopant areincluded in the second electron transporting layer 601. In addition, thesecond electron transporting layer 601 and the p-type organic materiallayer 801 may constitute a charge generating layer 901.

Furthermore, the materials for the first hole transporting layer 301 andthe second hole transporting layer 302 may be the same as or differentfrom each other. FIG. 4 is a view describing a diode in which chargegenerating layers 901 and 902 are stacked in two or more layers, andillustrates the structure of a tandem-type organic light emitting diodein which an anode 201, a hole injection layer 1001, a first holetransporting layer 301, a first light emitting layer 401, a firstelectron transporting layer 501, a second electron transporting layer601, a first p-type organic material layer 801, a second holetransporting layer 302, a second light emitting layer 402, a firstelectron transporting layer 502, a second electron transporting layer602, a second p-type organic material layer 802, a third holetransporting layer 303, a third light emitting layer 403, an electrontransporting layer 1101, and a cathode 701 are sequentially stacked on asubstrate 101.

In FIG. 4, the heterocyclic compound represented by Formula 1 isincluded in the first electron transporting layers 501 and 502, and oneor more of the compounds represented by Formulae 3 to 5 and a metaldopant are included in the second electron transporting layers 601 and602. Further, the second electron transporting layers 601 and 602 andthe p-type organic material layers 801 and 802 may constitute a firstcharge generating layer 901 and a second charge generating layer 902,respectively.

The materials for the first hole transporting layer 301, the second holetransporting layer 302, and the third hole transporting layer 303 may bethe same as or different from each other, and the materials for thefirst p-type organic material layer 801 and the second p-type organicmaterial layer 802 may be the same as or different from each other.

FIGS. 1 to 4 illustrate exemplified structures according to exemplaryembodiments of the present specification, and the structure is notlimited thereto.

When the organic light emitting diode includes a plurality of organicmaterial layers, the organic material layer may be formed of the samematerial or different materials.

As the anode material, a material having a large work function isusually preferred so as to smoothly inject holes into an organicmaterial layer. Examples of an anode material which may be used in thepresent invention include: a metal, such as vanadium, chromium, copper,zinc, and gold, or alloys thereof; a metal oxide, such as zinc oxide,indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); acombination of metal and oxide, such as ZnO:Al or SnO₂:Sb; anelectrically conductive polymer, such as poly(3-methylthiophene),poly[3,4-(ethylene-1,2-dioxy)thiophene] (PEDOT), polypyrrole, andpolyaniline, and the like, but are not limited thereto.

As the cathode material, a material having a small work function isusually preferred so as to smoothly inject electrons into an organicmaterial layer. Specific examples of a cathode material include: ametal, such as magnesium, calcium, sodium, potassium, titanium, indium,yttrium, lithium, gadolinium, aluminum, silver, tin, or lead, or alloysthereof; a multi-layered structural material, such as LiF/Al or LiO₂/Al,and the like, but are not limited thereto.

As the hole injection material, a compound is preferred, in which thehole injection material has a capability of transporting holes to alayer which injects holes from an electrode, and thus has an effect ofinjecting holes at the anode and an excellent effect of injecting holesfor the light emitting layer or the light emitting material, preventsexcitons produced from the light emitting layer from moving to anelectron injection layer or an electron injection material, and hasexcellent capability of forming a thin film. It is preferred that thehighest occupied molecular orbital (HOMO) of the hole injection materialis between the work function of the anode material and the HOMO of theorganic material layer. Specific examples of the hole injection materialinclude metal porphyrin, oligothiophene, an arylamine-based organicmaterial, a hexanitrile hexaazatriphenylene-based organic material, aquinacridone-based organic material, a perylene-based organic material,anthraquinone, a polyaniline and polythiophene-based electricallyconductive polymer, and the like, but are not limited thereto.

The hole transporting layer is a layer which receives holes from thehole injection layer and transports holes to the light emitting layer,and a hole transporting material is suitably a material which mayreceive holes from an anode or a hole injection layer and may transferholes to a light emitting layer, and has a large mobility for the holes.Specific examples thereof include an arylamine-based organic material,an electrically conductive polymer, a block copolymer in which aconjugate portion and a non-conjugate portion are present together, andthe like, but are not limited thereto.

The light emitting material is a material which may receive holes andelectrons from the hole transporting layer and the electron transportinglayer, respectively, and combine the holes and the electrons to emitlight in a visible ray region, and is preferably a material having goodquantum efficiency to fluorescence or phosphorescence. Specific examplesthereof comprise a 8-hydroxy-quinoline aluminum complex (Alq₃); acarbazole-based compound; a dimerized styryl compound; BAlq; a10-hydroxybenzoquinoline-metal compound; a benzoxazole, benzthiazole andbenzimidazole-based compound; a poly(p-phenylenevinylene) (PPV)-basedpolymer; a spiro compound; polyfluorene, lubrene, and the like, but arenot limited thereto.

The light emitting layer may include a host material and a dopantmaterial. Examples of the host material include a condensed aromaticring derivative, or a hetero ring-containing compound, and the like.Specifically, examples of the condensed aromatic ring derivative includean anthracene derivative, a pyrene derivative, a naphthalene derivative,a pentacene derivative, a phenanthrene compound, a fluoranthenecompound, and the like, and examples of the hetero ring-containingcompound include a carbazole derivative, a dibenzofuran derivative, aladder-type furan compound, a pyrimidine derivative, and the like, butare not limited thereto.

In the fluorescence light emitting layer, as the host material, one ortwo or more are selected from the group consisting of distyrylarylene(DSA), a distyrylarylene derivative, distyrylbenzene (DSB), adistyrylbenzene derivative, 4,4′-bis(2,2′-diphenyl vinyl)-1,1′-biphenyl(DPVBi), a DPVBi derivative, spiro-DPVBi, and spiro-6P.

In the fluorescence light emitting layer, as the dopant material, one ortwo or more are selected from the group consisting of styrylamine-based,pherylene-based, and distyrylbiphenyl (DSBP)-based dopant materials.

The electron injection layer is a layer which injects electrons from anelectrode, and a compound is preferred, which has a capability oftransporting electrons, has an effect of injecting electrons from acathode and an excellent effect of injecting electrons into a lightemitting layer or a light emitting material, prevents excitons producedfrom the light emitting layer from moving to the hole injection layer,and is also excellent in capability of forming a thin film. Specificexamples thereof include fluorenone, anthraquinodimethane,diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole,imidazole, perylenetetracarboxylic acid, fluorenylidene methane,anthrone and derivatives thereof, a metal complex compound, anitrogen-containing 5-membered derivative, and the like, but are notlimited thereto.

Examples of the metal complex compound include 8-hydroxyquinolinatolithium, bis(8-hydroxyquinolinato) zinc, bis(8-hydroxyquinolinato)copper, bis(8-hydroxyquinolinato) manganese, tris(8-hydroxyquinolinato)aluminum, tris(2-methyl-8-hydroxyquinolinato) aluminum,tris(8-hydroxyquinolinato) gallium, bis(10-hydroxybenzo[h]quinolinato)beryllium, bis(10-hydroxybenzo[h]quinolinato) zinc,bis(2-methyl-8-quinolinato) chlorogallium, bis(2-methyl-8-quinolinato)(o-cresolato) gallium, bis(2-methyl-8-quinolinato) (1-naphtholato)aluminum, bis(2-methyl-8-quinolinato) (2-naphtholato) gallium, and thelike, but are not limited thereto.

The hole blocking layer is a layer which blocks holes from reaching acathode, and may be generally formed under the same conditions as thoseof the hole injection layer. Specific examples thereof include anoxadiazole derivative or a triazole derivative, a phenanthrolinederivative, BCP, an aluminum complex, and the like, but are not limitedthereto.

The organic light emitting diode according to the present specificationmay be a top emission type, a bottom emission type, or a dual emissiontype according to the material to be used.

In addition, the organic light emitting diode according to the presentspecification may be a normal type in which a lower electrode is ananode and an upper electrode is a cathode, and may also be an invertedtype in which a lower electrode is a cathode and an upper electrode isan anode.

The structure according to an exemplary embodiment of the presentspecification may be operated by a principle which is similar to theprinciple applied to an organic light emitting diode, even in an organicelectronic diode including an organic solar cell, an organicphotoconductor, an organic transistor, and the like.

MODE FOR INVENTION

Hereinafter, the present specification will be described in detail withreference to Examples for specifically describing the presentspecification. However, the Examples according to the presentspecification may be modified in various forms, and it is notinterpreted that the scope of the present specification is limited tothe Examples described below in detail. The Examples of the presentspecification are provided for more completely explaining the presentspecification to the person with ordinary skill in the art.

Example 1

The values of the HOMO energy level and the triplet energy (E_(T)) ofthe heterocyclic compound represented by Formula 1 according to anexemplary embodiment of the present specification, and the followingFormulae ET-A and ET-B are shown in the following Table 1.

In the Examples of the present specification, the HOMO level wasmeasured by using an atmospheric pressure photoelectron spectrometer AC3(manufactured by RIKEN KEIKI Co., Ltd.).

Further, the triplet energy (E_(T)) was calculated by using a quantumchemical calculation program Gaussian 03 manufactured by U.S. GaussianCorporation, and a density functional theory (DFT) was used and thecalculated value of the triplet energy was obtained by thetime-dependent-density functional theory (TD-DFT) with respect to astructure optimized using B3LYP as a functional and 6-31G* as a basisfunction.

TABLE 1 Formula HOMO (eV) E_(T) (eV) 1-1 6.45 2.80 1-6 6.37 2.62 1-86.38 2.78 1-30 6.44 2.62 1-32 6.43 2.78 1-54 6.35 2.62 1-92 6.30 2.461-102 6.27 2.46 1-116 6.29 2.57 1-128 6.32 2.47 1-138 6.29 2.47 1-1606.37 2.79 1-229 6.32 2.57 1-237 6.28 2.46 1-279 6.31 2.46 2-5 6.22 2.622-6 6.25 2.70 2-28 6.32 2.71 2-141 6.15 2.43 2-269 6.13 2.44 2-282 6.192.45 ET-A 5.71 1.64 ET-B 5.75 1.64

Example 2

The dipole moment values of the heterocyclic compound represented byFormula 1 according to an exemplary embodiment of the presentspecification are shown in Table 2.

TABLE 2 Dipole moment Formula (Debye) 1-6 0.85 1-8 0.51 1-30 0.8

Example 1-1

A glass substrate thinly coated with indium tin oxide (ITO) to have athickness of 500 Å was put into distilled water in which a detergent wasdissolved, and ultrasonically washed. In this case, a productmanufactured by Fischer Co. was used as the detergent, and distilledwater twice filtered using a filter manufactured by Millipore Co. wasused as the distilled water. After the ITO was washed for 30 minutes,ultrasonic washing was conducted twice using distilled water for 10minutes. After the washing using distilled water was completed,ultrasonic washing was conducted using isopropyl alcohol, acetone, andmethanol solvents, and drying was conducted, and then the product wastransported to a plasma washing machine. In addition, the substrate waswashed using oxygen plasma for 5 min, and then transported to a vacuumevaporator.

The following Formula [HAT] was thermally vacuum deposited to athickness of 50 Å on a transparent ITO electrode, which was prepared asdescribed above, thereby forming a hole injection layer. The followingFormula [NPB] was vacuum deposited to have a thickness of 1,100 Å on thehole injection layer, thereby forming a hole transporting layer. Thefollowing Formula [HT-A] was vacuum deposited to have a thickness of 200Å on the hole transporting layer, thereby forming an electron blockinglayer.

Subsequently, the following Formulae [BH] and [BD] were vacuum depositedat a weight ratio of 25:1 to a film thickness of 350 Å on the electronblocking layer, thereby forming a light emitting layer.

Formula 1-1 and the following Formula [LiQ] were vacuum deposited at aweight ratio of 1:1 on the light emitting layer, thereby forming a firstelectron transporting layer having a thickness of 200 Å. Formula 3-1 and[Li] were vacuum deposited at a weight ratio of 100:1 on the firstelectron transporting layer, thereby forming a second electrontransporting layer having a thickness of 100 Å.

Aluminum was deposited to have a thickness of 1,000 Å on the secondelectron transporting layer, thereby forming a cathode.

In the aforementioned procedure, the deposition rate of the organicmaterial was maintained at 0.4 to 0.9 Å/sec, the deposition rate oflithium fluoride of the cathode was maintained at 0.3 Å/sec, and thedeposition rate of aluminum was maintained at 2 Å/sec, and the degree ofvacuum during the deposition was maintained at 1×10⁻⁷ to 5×10⁻⁸ torr,thereby manufacturing an organic light emitting diode.

Example 1-2

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-6] and [Formula 5-14] were usedinstead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-3

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-30] and [Formula 3-16] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-4

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-32] and [Formula 4-2] were usedinstead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-5

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-54] and [Formula 3-32] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-6

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-92] and [Formula 3-32] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-7

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-102] and [Formula 4-35] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-8

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-138] and [Formula 4-3] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-9

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-160] was used instead of[Formula 1-1] of [Example 1-1].

Example 1-10

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-237] and [Formula 4-2] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-11

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-5] and [Formula 3-15] were usedinstead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-12

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-6] and [Formula 5-32] were usedinstead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-13

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-28] and [Formula 5-14] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-14

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-141] and [Formula 3-22] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-15

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-269] and [Formula 5-10] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-16

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 2-282] and [Formula 4-3] wereused instead of [Formula 1-1] and [Formula 3-1] of [Example 1-1],respectively.

Example 1-17

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except for [Liq] of [Example 1-2].

Example 1-18

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except that [Formula 3-1] was used instead of [Formula5-14] of [Example 1-2].

Example 1-19

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except that [Formula 4-2] was used instead of [Formula5-14] of [Example 1-2].

Example 1-20

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except that [Formula 1-8] was used instead of [Formula1-6] of [Example 1-2].

Comparative Example 1-1

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 3-1] was used instead of [Formula1-1] of [Example 1-1].

Comparative Example 1-2

An organic light emitting diode was manufactured in the same manner asin [Example 1-4], except that [Formula 4-2] was used instead of [Formula1-32] of [Example 1-4].

Comparative Example 1-3

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except that [Formula 5-14] was used instead of[Formula 1-6] of [Example 1-2].

Comparative Example 1-4

An organic light emitting diode was manufactured in the same manner asin [Example 1-4], except for [Li] of [Example 1-4].

Comparative Example 1-5

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula ET-A] was used instead of[Formula 1-1] of [Example 1-1].

Comparative Example 1-6

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula Alq3] was used instead of[Formula 1-1] of [Example 1-1].

Comparative Example 1-7

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula TPBI] was used instead of[Formula 1-1] of [Example 1-1].

Comparative Example 1-8

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula ET-B] was used instead of[Formula 1-1] of [Example 1-1].

Comparative Example 1-9

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula ET-C] was used instead of[Formula 1-1] of [Example 1-1].

Comparative Example 1-10

An organic light emitting diode was manufactured in the same manner asin [Example 1-4], except that [Formula ET-D] was used instead of[Formula 1-32] of [Example 1-4].

Comparative Example 1-11

An organic light emitting diode was manufactured in the same manner asin [Example 1-2], except that [Formula ET-E] was used instead of[Formula 1-6] of [Example 1-2].

Comparative Example 1-12

An organic light emitting diode was manufactured in the same manner asin [Example 1-1], except that [Formula 1-1] was used instead of [Formula3-1] of [Example 1-1].

For the organic light emitting diodes manufactured by theabove-described method, the driving voltage and the light emittingefficiency were measured at a current density of 10 mA/cm², and a timeT90 for reaching a 90% value compared to the initial luminance wasmeasured at a current density of 20 mA/cm². The results are shown in thefollowing Table 3.

TABLE 3 Color Service life Voltage Efficiency Coordinate (h) (V) (Cd/A)(x, y) T₉₀ at 20 mA/cm² Example 1-1 4.32 6.42 (0.138, 0.112) 152 Example1-2 3.92 6.95 (0.138, 0.110) 192 Example 1-3 4.27 6.66 (0.138, 0.111)162 Example 1-4 4.35 6.26 (0.138, 0.113) 155 Example 1-5 4.22 6.53(0.138, 0.112) 182 Example 1-6 4.38 6.53 (0.138, 0.112) 157 Example 1-74.51 6.22 (0.138, 0.113) 181 Example 1-8 4.21 6.65 (0.138, 0.113) 192Example 1-9 4.57 6.32 (0.138, 0.114) 149 Example 1-10 4.42 6.22 (0.138,0.112) 171 Example 1-11 4.26 6.58 (0.138, 0.111) 166 Example 1-12 4.136.59 (0.138, 0.111) 170 Example 1-13 4.10 6.77 (0.138, 0.110) 187Example 1-14 4.52 6.20 (0.138, 0.114) 199 Example 1-15 4.02 6.69 (0.138,0.111) 172 Example 1-16 4.21 6.55 (0.138, 0.112) 182 Example 1-17 4.056.75 (0.138, 0.110) 152 Example 1-18 4.01 6.85 (0.138, 0.110) 176Example 1-19 4.06 6.71 (0.138, 0.110) 162 Example 1-20 4.09 6.73 (0.138,0.111) 172 Comparative 4.75 5.32 (0.138, 0.115) 79 Example 1-1Comparative 5.35 4.52 (0.138, 0.114) 142 Example 1-2 Comparative 4.925.20 (0.138, 0.114) 132 Example 1-3 Comparative 7.29 3.21 (0.138, 0.115)59 Example 1-4 Comparative 4.95 5.50 (0.138, 0.113) 132 Example 1-5Comparative 5.1 4.42 (0.138, 0.115) 95 Example 1-6 Comparative 4.79 5.20(0.138, 0.114) 87 Example 1-7 Comparative 5.12 4.32 (0.138, 0.115) 112Example 1-8 Comparative 4.72 5.52 (0.138, 0.112) 124 Example 1-9Comparative 4.88 5.29 (0.138, 0.114) 92 Example 1-10 Comparative 4.605.79 (0.138, 0.111) 132 Example 1-11 Comparative 6.21 3.20 (0.138,0.115) 53 Example 1-12

From the result of Table 3, it can be confirmed that the compoundrepresented by Formula 1 according to an exemplary embodiment of thepresent specification may be used as a first electron transporting layerof the organic light emitting diode, and the compound represented byFormula 3 to 5 according to an exemplary embodiment of the presentspecification may be used as a second electron transporting layer of theorganic light emitting diode.

In particular, the compound represented by Formula 1 according to thepresent invention was excellent in thermal stability, and had a deepHOMO level of 6.0 eV or more, and high triplet energy (E_(T)) and holestability, thereby exhibiting excellent characteristics. When thecompound represented by Formula 1 is used in the first electrontransporting layer, an alkali organic metal compound or an alkalineearth metal organic metal compound may be used in a mixture with ann-type dopant. Accordingly, the compound represented by Formula 1 haslow driving voltage and high efficiency, and stability of the diode maybe improved by hole stability of the compound.

As a result of Table 1, it can be confirmed that both the compoundsrepresented by Formulae [ET-A] and [ET-B] have a triplet energy of lessthan 1.9 eV, and as a result of the Examples and the ComparativeExamples of Table 3, it can be confirmed that a compound having atriplet energy of less than 2.2 eV has low diode efficiency. Theseresults are because an effect of the triplet-triplet annihilation (TTA)is reduced when a compound having a triplet energy of less than 2.2 eVis used.

Further, it can be confirmed through Table 1 that the compoundsrepresented by Formulae [ET-A] and [ET-B] have a HOMO level of less than6 eV, and as a result of the evaluation of the diode of Table 3, it canbe confirmed that the diode has a short service life when the diodeincludes the compound. The result as described above is exhibitedbecause an effect of blocking holes transferred from the light emittinglayer is reduced in the organic light emitting diode including thecompound having a HOMO energy level of less than 6 eV.

Accordingly, it can be confirmed that even for the heterocyclic compoundrepresented by Formula 1 according to an exemplary embodiment of thepresent invention, those having a HOMO energy level of 6 eV or more anda triplet energy of 2.2 eV are more preferred in terms of drivingvoltage, efficiency, and/or service life of the diode.

Further, according to the document (J. AM. CHEM. SOC. 2003, 125,3710-3711), it can be confirmed that a disubstituted fluorenyl group hasa higher electron mobility than that of a spirobifluorenyl group.Accordingly, it can be confirmed that the compound represented byFormula 1 may transport electrons more efficiently than Formula [ET-D]used in the Comparative Examples and thus exhibits high efficiency, andalso improves the service life.

From the result of Table 3, it can be confirmed that the compoundrepresented by Formula 1 is not suitable for the second electrontransporting layer doped with a metal. For the second electrontransporting layer doped with the metal, the compound represented byFormulae 3 to 5 instead of Formula 1 exhibited low driving voltage andhigh efficiency. The result described above may be exhibited because theunshared electron pair of a nitrogen atom or an oxygen atom of aphosphine oxide group of the compound represented by Formulae 3 to 5 maybe effectively bonded to a metal, and thus a doping by a metal dopanteffectively occurs. Accordingly, when a second electron transportinglayer including the compound represented by Formulae 3 to 5 and ann-type dopant of a metal is used, electrons are smoothly transportedand/or injected from the cathode, and an organic light emitting diodehaving low driving voltage may be provided.

Further, when the organic light emitting diode is driven, an unsharedelectron pair of a nitrogen atom or an oxygen atom of a phosphine oxidegroup may be bonded to metal to prevent metal from moving by a fieldapplied to the organic material layer, thereby suppressing the drivingvoltage of the organic light emitting diode from being increased, and itis possible to implement an organic light emitting diode having a longservice life.

Example 2-1

A glass substrate thinly coated with indium tin oxide (ITO) to have athickness of 500 Å was put into distilled water in which a detergent wasdissolved, and ultrasonically washed. In this case, a productmanufactured by Fischer Co. was used as the detergent, and distilledwater twice filtered using a filter manufactured by Millipore Co. wasused as the distilled water. After the ITO was washed for 30 minutes,ultrasonic washing was conducted twice using distilled water for 10minutes. After the washing using distilled water was completed,ultrasonic washing was conducted using isopropyl alcohol, acetone, andmethanol solvents, and drying was conducted, and then the product wastransported to a plasma washing machine. In addition, the substrate waswashed using oxygen plasma for 5 minutes, and then transported to avacuum evaporator.

Formula [HAT] was thermally vacuum deposited to have a thickness of 50 Åon a transparent ITO electrode, which was prepared as described above,thereby forming a hole injection layer. Formula [NPB] was vacuumdeposited to have a thickness of 1,100 Å on the hole injection layer,thereby forming a hole transporting layer. Formula [HT-A] was vacuumdeposited to have a thickness of 200 Å on the hole transporting layer,thereby forming an electron blocking layer.

Formulae [BH] and [BD] were vacuum deposited at a weight ratio of 25:1to have a film thickness of 350 Å on the electron blocking layer,thereby forming a light emitting layer.

Formula 1-6 and Formula [LiQ] were vacuum deposited at a weight ratio of1:1 on the light emitting layer, thereby forming a first electrontransporting layer having a thickness of 200 Å. Formula 5-14 and [Ca]were vacuum deposited at a weight ratio of 97:3 on the first electrontransporting layer, thereby forming a second electron transporting layerhaving a thickness of 100 Å.

Formula [HAT] was thermally vacuum deposited to have a thickness of 50 Åon the second electron transporting layer, thereby forming a p-typeorganic material layer. Formula [NPB] was vacuum deposited to have athickness of 200 Å on the p-type organic material layer, thereby forminga hole transporting layer. Formula [HT-A] was vacuum deposited to have athickness of 200 Å on the hole transporting layer, thereby forming anelectron blocking layer.

The following Formulae [YGD] and [YGH] were vacuum deposited at a weightratio of 1:13 to have a film thickness of 350 Å on the electron blockinglayer, thereby forming a light emitting layer.

Formula 1-6 and Formula [LiQ] were vacuum deposited at a weight ratio of1:1 on the light emitting layer, thereby forming a first electrontransporting layer having a thickness of 200 Å. Formula 5-14 and Formula[Ca] were vacuum deposited at a weight ratio of 97:3 on the firstelectron transporting layer, thereby forming a second electrontransporting layer having a thickness of 100 Å. Aluminum was depositedto have a thickness of 1,000 Å on the second electron transportinglayer, thereby forming a cathode.

In the aforementioned procedure, the deposition rate of the organicmaterial was maintained at 0.4 to 0.9 Å/sec, the deposition rate oflithium fluoride of the cathode was maintained at 0.3 Å/sec, and thedeposition rate of aluminum was maintained at 2 Å/sec, and the degree ofvacuum during the deposition was maintained at 1×10−7 to 5×10−8 torr,thereby manufacturing an organic light emitting diode.

Example 2-2

An organic light emitting diode was manufactured in the same manner asin [Example 2-1], except that [NPB] and [Formula 8-1] were deposited ata weight ratio of 95:5 and used instead of [HAT] of [Example 2-1].

Comparative Example 2-1

An organic light emitting diode was manufactured in the same manner asin [Example 2-1], except that [ET-A] was used instead of [Formula 1-6]of [Example 2-1].

Comparative Example 2-2

An organic light emitting diode was manufactured in the same manner asin [Example 2-1], except that [Formula 1-8] was used instead of [Formula5-14] of [Example 2-1].

For the organic light emitting diodes manufactured by theabove-described method, the driving voltage and the light emittingefficiency were measured at a current density of 10 mA/cm², and a time(T90) for reaching a 90% value compared to the initial luminance wasmeasured at a current density of 20 mA/cm². The results are shown in thefollowing Table 4.

TABLE 4 Service life Voltage Efficiency Color Coordinate (h) (V) (Cd/A)(x, y) T₉₀ at 20 mA/cm² Example 2-1 7.9 69.15 (0.365, 0.389) 251 Example2-2 7.8 70.15 (0.365, 0.380) 245 Comparative 9.5 55.15 (0.366, 0.401)152 Example 2-1 Comparative 13.2 28.9 (0.369, 0.421) 39 Example 2-2

From the result of Table 4, it can be confirmed that the compoundrepresented by Formula 1 according to an exemplary embodiment of thepresent specification may be used as a first electron transporting layerof the organic light emitting diode, and the compound represented byFormula 3 to 5 according to an exemplary embodiment of the presentspecification may be used as a second electron transporting layer of theorganic light emitting diode.

In particular, the compound represented by Formula 1 according to thepresent invention was excellent in thermal stability, and had a deepHOMO level of 6.0 eV or more, and high triplet energy (E_(T)) and holestability, thereby exhibiting excellent characteristics. When thecompound represented by Formula 1 is used in the first electrontransporting layer, an alkali organic metal compound or an alkalineearth metal organic metal compound may be used in a mixture with ann-type dopant. Accordingly, the compound represented by Formula 1 haslow driving voltage and high efficiency, and stability of the diode maybe improved by hole stability of the compound.

From the result of Table 4, it can be confirmed that when an NP junctionis formed by using the compound represented by Formulae 3 to 5 as asecond electron transporting layer, which is an n-type organic materiallayer, and the compound represented by Formulae 7 to 9 as a p-typeorganic material layer, electrons are smoothly produced from the p-typeorganic material layer to the second electron transporting layer, andthus it is possible to implement an organic light emitting diode havingan effective tandem structure.

1. An organic light emitting diode comprising: a cathode; an anode; alight emitting layer provided between the cathode and the anode; a firstelectron transporting layer comprising a heterocyclic compoundrepresented by the following Formula 1 and provided between the cathodeand the light emitting layer; and a second electron transporting layerprovided between the cathode and the first electron transporting layer,wherein the second electron transporting layer includes a host materialincluding one or two or more of compounds represented by the followingFormula 4, and one or two or more n-type dopants selected from alkalimetals and alkaline earth metals:

in Formula 1, Ar1 to Ar3 are different from each other, Ar1 and Ar2 areeach independently a substituted or unsubstituted aryl group; or asubstituted or unsubstituted heterocyclic group, Ar3 is represented bythe following Formula 2,

in Formula 2, R1 to R4 are the same as or different from each other, andeach independently hydrogen; deuterium; a halogen group; a nitrilegroup; a nitro group; a hydroxy group; a substituted or unsubstitutedalkyl group; a substituted or unsubstituted cycloalkyl group; asubstituted or unsubstituted alkoxy group; a substituted orunsubstituted aryloxy group; a substituted or unsubstituted alkylthioxygroup; a substituted or unsubstituted arylthioxy group; a substituted orunsubstituted alkylsulfoxy group; a substituted or unsubstitutedarylsulfoxy group; a substituted or unsubstituted alkenyl group; asubstituted or unsubstituted silyl group; a substituted or unsubstitutedboron group; a substituted or unsubstituted aryl group; or a substitutedor unsubstituted heterocyclic group, or combine with an adjacent groupto form a substituted or unsubstituted hydrocarbon ring or a substitutedor unsubstituted hetero ring, or the substituents in the same carboncombine with each other to form a substituted or unsubstituted spirobond, L1 is a direct bond; a substituted or unsubstituted arylene group;or a substituted or unsubstituted divalent heterocyclic group, l is aninteger of 1, m is an integer of 1 to 3, n is an integer of 1 to 4, whenm, and n are each an integer of 2 or more, two or more structures in theparenthesis are the same as or different from each other,

in Formula 4, q is an integer of 1 to 4, r is an integer of 1 to 8, andwhen q and r are an integer of 2 or more, two or more structures in theparenthesis are the same as or different from each other, T9 and T10 arethe same as or different from each other, and each independentlyhydrogen; deuterium; a halogen group; a nitrile group; a nitro group; ahydroxy group; a substituted or unsubstituted alkyl group; a substitutedor unsubstituted cycloalkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted aryloxy group; a substituted orunsubstituted alkylthioxy group; a substituted or unsubstitutedarylthioxy group; a substituted or unsubstituted alkylsulfoxy group; asubstituted or unsubstituted arylsulfoxy group; a substituted orunsubstituted alkenyl group; a substituted or unsubstituted silyl group;a substituted or unsubstituted boron group; a substituted orunsubstituted aryl group; or a substituted or unsubstituted heterocyclicgroup, or combine with an adjacent group to form a substituted orunsubstituted hydrocarbon ring or a substituted or unsubstituted heteroring, at least one of T9 and T10 has the following structure,

L4 is a direct bond; a substituted or unsubstituted arylene group; or asubstituted or unsubstituted divalent heterocyclic group, X1 is O; S; orSe, Ar4 and Ar5 are the same as or different from each other, and eachindependently a substituted or unsubstituted aryl group; or asubstituted or unsubstituted heterocyclic group,
 2. (canceled) 3.(canceled)
 4. (canceled)
 5. (canceled)
 6. (canceled)
 7. The organiclight emitting diode of claim 1, wherein the first electron transportinglayer further comprises an n-type dopant represented by the followingFormula 10:

A3 is hydrogen; deuterium; a halogen group; a nitrile group; a nitrogroup; a hydroxy group; a substituted or unsubstituted alkyl group; asubstituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; or substituted or unsubstitutedheterocyclic group, a curved line represents a bond required for forminga 5-membered or 6-membered ring having M, and two or three atoms, andthe atom is unsubstituted or substituted with a substituent which is thesame as the definition of one or two or more A's, and M is an alkalimetal or an alkaline earth metal.
 8. The organic light emitting diode ofclaim 7, wherein the n-type dopant represented by Formula 10 isrepresented by the following Formula 10-1 or 10-2:

in Formulae 10-1 and 10-2, M is the same as that defined in Formula 10,and Formulae 10-1 and 10-2 are each independently unsubstituted orsubstituted with one or two or more substituents selected from the groupconsisting of hydrogen; deuterium; a halogen group; a nitrile group; anitro group; a hydroxy group; a substituted or unsubstituted alkylgroup; a substituted or unsubstituted cycloalkyl group; a substituted orunsubstituted alkoxy group; a substituted or unsubstituted aryloxygroup; a substituted or unsubstituted alkylthioxy group; a substitutedor unsubstituted arylthioxy group; a substituted or unsubstitutedalkylsulfoxy group; a substituted or unsubstituted arylsulfoxy group; asubstituted or unsubstituted alkenyl group; a substituted orunsubstituted silyl group; a substituted or unsubstituted boron group; asubstituted or unsubstituted aryl group; and a substituted orunsubstituted heterocyclic group, or adjacent substituents combine witheach other to form a substituted or unsubstituted hydrocarbon ring or asubstituted or unsubstituted hetero ring.
 9. (canceled)
 10. The organiclight emitting diode of claim 1, wherein a triplet energy of theheterocyclic compound represented by Formula 1 is 2.2 eV or more. 11.The organic light emitting diode of claim 1, wherein a dipole moment ofthe heterocyclic compound represented by Formula 1 is 2 debye or less.12. The organic light emitting diode of claim 1, wherein an electronmobility of the heterocyclic compound represented by Formula 1 is 10⁻⁶cm²/Vs or more.
 13. The organic light emitting diode of claim 1, whereinthe first electron transporting layer is provided to be in contact witha light emitting layer.
 14. The organic light emitting diode of claim 1,wherein the heterocyclic compound represented by Formula 1 isrepresented by the following Formula 1-B:

R1 to R4, Ar1, L1, l, m, and n are the same as defined in Formula 1, x1is an integer of 1 to 5, x2 is an integer of 1 to 4, and when x1 and x2are an integer of 2 or more, two or more structures in the parenthesisare the same as or different from each other, and X1 and X2 are the sameas or different from each other, and each independently hydrogen;deuterium; a halogen group; a nitrile group; a nitro group; a hydroxygroup; a substituted or unsubstituted alkyl group; a substituted orunsubstituted cycloalkyl group; a substituted or unsubstituted alkoxygroup; a substituted or unsubstituted aryloxy group; a substituted orunsubstituted alkylthioxy group; a substituted or unsubstitutedarylthioxy group; a substituted or unsubstituted alkylsulfoxy group; asubstituted or unsubstituted arylsulfoxy group; a substituted orunsubstituted alkenyl group; a substituted or unsubstituted silyl group;a substituted or unsubstituted boron group; a substituted orunsubstituted aryl group; or a substituted or unsubstituted heterocyclicgroup, or two or more adjacent groups combine with each other to form asubstituted or unsubstituted hydrocarbon ring; or a substituted orunsubstituted hetero ring.
 15. (canceled)
 16. (canceled)
 17. (canceled)18. The organic light emitting diode of claim 1, wherein theheterocyclic compound represented by Formula 1 is represented by any oneof the following Formulae 1-1 to 1-627 and 2-1 to 2-363: Formula - - -Ar1 - - - Ar2 - - - Ar3 1-1

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

1-11

1-12

1-13

1-14

1-15

1-16

1-17

1-18

1-19

1-20

1-21

1-22

1-23

1-24

1-25

1-26

1-27

1-28

1-29

1-30

1-31

1-32

1-33

1-34

1-35

1-36

1-37

1-38

1-39

1-40

1-41

1-42

1-43

1-44

1-45

1-46

1-47

1-48

1-49

1-50

1-51

1-52

1-53

1-54

1-55

1-56

1-57

1-58

1-59

1-60

1-61

1-62

1-63

1-64

1-65

1-66

1-67

1-68

1-69

1-70

1-71

1-72

1-73

1-74

1-75

1-76

1-77

1-78

1-79

1-80

1-81

1-82

1-83

1-84

1-85

1-86

1-87

1-88

1-89

1-90

1-91

1-92

1-93

1-94

1-95

1-96

1-97

1-98

1-99

1-100

1-101

1-102

1-103

1-104

1-105

1-106

1-107

1-108

1-109

1-110

1-111

1-112

1-113

1-114

1-115

1-116

1-117

1-118

1-119

1-120

1-121

1-122

1-123

1-124

1-125

1-126

1-127

1-128

1-129

1-130

1-131

1-132

1-133

1-134

1-135

1-136

1-137

1-138

1-139

1-140

1-141

1-142

1-143

1-144

1-145

1-146

1-147

1-148

1-149

1-150

1-151

1-152

1-153

1-154

1-155

1-156

1-157

1-158

1-159

1-160

1-161

1-162

1-163

1-164

1-165

1-166

1-167

1-168

1-169

1-170

1-171

1-172

1-173

1-174

1-175

1-176

1-177

1-178

1-179

1-180

1-181

1-182

1-183

1-184

1-185

1-186

1-187

1-188

1-189

1-190

1-191

1-192

1-193

1-194

1-195

1-196

1-197

1-198

1-199

1-200

1-201

1-202

1-203

1-204

1-205

1-206

1-207

1-208

1-209

1-210

1-211

1-212

1-213

1-214

1-215

1-216

1-217

1-218

1-219

1-220

1-221

1-222

1-223

1-224

1-225

1-226

1-227

1-228

1-229

1-230

1-231

1-232

1-233

1-234

1-235

1-236

1-237

1-238

1-239

1-240

1-241

1-242

1-243

1-244

1-245

1-246

1-247

1-248

1-249

1-250

1-251

1-252

1-253

1-254

1-255

1-256

1-257

1-258

1-259

1-260

1-261

1-262

1-263

1-264

1-265

1-266

1-267

1-268

1-269

1-270

1-271

1-272

1-273

1-274

1-275

1-276

1-277

1-278

1-279

1-280

1-281

1-282

1-283

1-284

1-285

1-286

1-287

1-288

1-289

1-290

1-291

1-292

1-293

1-294

1-295

1-296

1-297

1-298

1-299

1-300

1-301

1-302

1-303

1-304

1-305

1-306

1-307

1-308

1-309

1-310

1-311

1-312

1-313

1-314

1-315

1-316

1-317

1-318

1-319

1-320

1-321

1-322

1-323

1-324

1-325

1-326

1-327

1-328

1-329

1-330

1-331

1-332

1-333

1-334

1-335

1-336

1-337

1-338

1-339

1-340

1-341

1-342

1-343

1-344

1-345

1-346

1-347

1-348

1-349

1-350

1-351

1-352

1-353

1-354

1-355

1-356

1-357

1-358

1-359

1-360

1-361

1-362

1-363

1-364

1-365

1-366

1-367

1-368

1-369

1-370

1-371

1-372

1-373

1-374

1-375

1-376

1-377

1-378

1-379

1-380

1-381

1-382

1-383

1-384

1-385

1-386

1-387

1-388

1-389

1-390

1-391

1-392

1-393

1-394

1-395

1-396

1-397

1-398

1-399

1-400

1-401

1-402

1-403

1-404

1-405

1-406

1-407

1-408

1-409

1-410

1-411

1-412

1-413

1-414

1-415

1-416

1-417

1-418

1-419

1-420

1-421

1-422

1-423

1-424

1-425

1-426

1-427

1-428

1-429

1-430

1-431

1-432

1-433

1-434

1-435

1-436

1-437

1-438

1-439

1-440

1-441

1-442

1-443

1-444

1-445

1-446

1-447

1-448

1-449

1-450

1-451

1-452

1-453

1-454

1-455

1-456

1-457

1-458

1-459

1-460

1-461

1-462

1-463

1-464

1-465

1-466

1-467

1-468

1-469

1-470

1-471

1-472

1-473

1-474

1-475

1-476

1-477

1-478

1-479

1-480

1-481

1-482

1-483

1-484

1-485

1-486

1-487

1-488

1-489

1-490

1-491

1-492

1-493

1-494

1-495

1-496

1-497

1-498

1-499

1-500

1-501

1-502

1-503

1-504

1-505

1-506

1-507

1-508

1-509

1-510

1-511

1-512

1-513

1-514

1-515

1-516

1-517

1-518

1-519

1-520

1-521

1-522

1-523

1-524

1-525

1-526

1-527

1-528

1-529

1-530

1-531

1-532

1-533

1-534

1-535

1-536

1-537

1-538

1-539

1-540

1-541

1-542

1-543

1-544

1-545

1-546

1-547

1-548

1-549

1-550

1-551

1-552

1-553

1-554

1-555

1-556

1-557

1-558

1-559

1-560

1-561

1-562

1-563

1-564

1-565

1-566

1-567

1-568

1-569

1-570

1-571

1-572

1-573

1-574

1-575

1-576

1-577

1-578

1-579

1-580

1-581

1-582

1-583

1-584

1-585

1-586

1-587

1-588

1-589

1-590

1-591

1-592

1-593

1-594

1-595

1-596

1-597

1-598

1-599

1-600

1-601

1-602

1-603

1-604

1-605

1-606

1-607

1-608

1-609

1-610

1-611

1-612

1-613

1-614

1-615

1-616

1-617

1-618

1-619

1-620

1-621

1-622

1-623

1-624

1-625

1-626

1-627

Formula ---Ar1 ---Ar2 ---Ar3 2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

2-11

2-12

2-13

2-14

2-15

2-16

2-17

2-18

2-19

2-20

2-21

2-22

2-23

2-24

2-25

2-26

2-27

2-28

2-29

2-30

2-31

2-32

2-33

2-34

2-35

2-36

2-37

2-38

2-39

2-40

2-41

2-42

2-43

2-44

2-45

2-46

2-47

2-48

2-49

2-50

2-51

2-52

2-53

2-54

2-55

2-56

2-57

2-58

2-59

2-60

2-61

2-62

2-63

2-64

2-65

2-66

2-67

2-68

2-69

2-70

2-71

2-72

2-73

2-74

2-75

2-76

2-77

2-78

2-79

2-80

2-81

2-82

2-83

2-84

2-85

2-86

2-87

2-88

2-89

2-90

2-91

2-92

2-93

2-94

2-95

2-96

2-97

2-98

2-99

2-100

2-101

2-102

2-103

2-104

2-105

2-106

2-107

2-108

2-109

2-110

2-111

2-112

2-113

2-114

2-115

2-116

2-117

2-118

2-119

2-120

2-121

2-122

2-123

2-124

2-125

2-126

2-127

2-128

2-129

2-130

2-131

2-132

2-133

2-134

2-135

2-136

2-137

2-138

2-139

2-140

2-141

2-142

2-143

2-144

2-145

2-146

2-147

2-148

2-149

2-150

2-151

2-152

2-153

2-154

2-155

2-156

2-157

2-158

2-159

2-160

2-161

2-162

2-163

2-164

2-165

2-166

2-167

2-168

2-169

2-170

2-171

2-172

2-173

2-174

2-175

2-176

2-177

2-178

2-179

2-180

2-181

2-182

2-183

2-184

2-185

2-186

2-187

2-188

2-189

2-190

2-191

2-192

2-193

2-194

2-195

2-196

2-197

2-198

2-199

2-200

2-201

2-202

2-203

2-204

2-205

2-206

2-207

2-208

2-209

2-210

2-211

2-212

2-213

2-214

2-215

2-216

2-217

2-218

2-219

2-220

2-221

2-222

2-223

2-224

2-225

2-226

2-227

2-228

2-229

2-230

2-231

2-232

2-233

2-234

2-235

2-236

2-237

2-238

2-239

2-240

2-241

2-242

2-243

2-244

2-245

2-246

2-247

2-248

2-249

2-250

2-251

2-252

2-253

2-254

2-255

2-256

2-257

2-258

2-259

2-260

2-261

2-262

2-263

2-264

2-265

2-266

2-267

2-268

2-269

2-270

2-271

2-272

2-273

2-274

2-275

2-276

2-277

2-278

2-279

2-280

2-281

2-282

2-283

2-284

2-285

2-286

2-287

2-288

2-289

2-290

2-291

2-292

2-293

2-294

2-295

2-296

2-297

2-298

2-299

2-300

2-301

2-302

2-303

2-304

2-305

2-306

2-307

2-308

2-309

2-310

2-311

2-312

2-313

2-314

2-315

2-316

2-317

2-318

2-319

2-320

2-321

2-322

2-323

2-324

2-325

2-326

2-327

2-328

2-329

2-330

2-331

2-332

2-333

2-334

2-335

2-336

2-337

2-338

2-339

2-340

2-341

2-342

2-343

2-344

2-345

2-346

2-347

2-348

2-349

2-350

2-351

2-352

2-353

2-354

2-355

2-356

2-357

2-358

2-359

2-360

2-361

2-362

2-363


19. The organic light emitting diode of claim 1, wherein a dipole momentof a host material comprised in the second electron transporting layeris 1 debye or more.
 20. (canceled)
 21. (canceled)
 22. (canceled)
 23. Theorganic light emitting diode of claim 1, wherein L4 is a combination ofone or two or more from the group consisting of a direct bond; asubstituted or unsubstituted phenylene group; a substituted orunsubstituted biphenylylene group; a substituted or unsubstitutednaphthalene group; a substituted or unsubstituted fluorenylene group;and a substituted or unsubstituted pyrenylene group.
 24. The organiclight emitting diode of claim 1, wherein the compound represented byFormula 4 is represented by any one of the following Formulae 4-1 to4-84:


25. (canceled)
 26. (canceled)
 27. (canceled)
 28. (canceled)
 29. Theorganic light emitting diode of claim 1, wherein the organic lightemitting diode comprises two or more light emitting layers, andcomprises a charge generating layer between two adjacent light emittinglayers in the two or more light emitting layers, the charge generatinglayer comprises the second electron transporting layer and a p-typeorganic material layer, and the first electron transporting layer isprovided between the light emitting layer and the second electrontransporting layer.
 30. (canceled)
 31. (canceled)
 32. The organic lightemitting diode of claim 29, wherein the p-type organic material layercomprises one or two or more compounds selected from the groupconsisting of the following Formulae 7 to 9:

in Formula 7, A10 to A15 are the same as or different from each other,and each independently hydrogen; a nitrile group; a nitro group; anamide group; a carbonyl group; a substituted or unsubstituted sulfonylgroup; a substituted or unsubstituted ester group; a substituted orunsubstituted alkyl group; a substituted or unsubstituted alkenyl group;a substituted or unsubstituted aryl group; or a substituted orunsubstituted heterocyclic group, or combine with an adjacent group toform a substituted or unsubstituted hydrocarbon ring or a substituted orunsubstituted hetero ring,

in Formula 8, A16 to A18 are the same as or different from each other,and each independently an aryl group, which is unsubstituted orsubstituted with one or two or more substituents selected from the groupconsisting of a cyano group, a halogen group, and a haloalkyl group; ora heterocyclic group, which is unsubstituted or substituted with one ortwo or more substituents selected from the group consisting of a cyanogroup, a halogen group, and a haloalkyl group,

in Formula 9, Ar10 is a substituted or unsubstituted hydrocarbon ring;or a substituted or unsubstituted hetero ring, Y1 to Y4 are the same asor different from each other, and each independently N; or CA23, A19 toA23 are the same as or different from each other, and each independentlyhydrogen; a nitrile group; a halogen group; a substituted orunsubstituted alkyl group; a substituted or unsubstituted alkoxy group;a substituted or unsubstituted aryloxy group; a substituted orunsubstituted aryl group; or a substituted or unsubstituted heterocyclicgroup, or combine with an adjacent group to form a substituted orunsubstituted hydrocarbon ring or a substituted or unsubstituted heteroring, Cy1 and Cy2 are the same as or different from each other, and eachindependently any one of the following structures, and

A24 to A26 are the same as or different from each other, and eachindependently a nitrile group; a substituted or unsubstituted estergroup; or a substituted or unsubstituted trifluoroalkyl group.